Here is my review about Xperia M5.
The phone design is looking good and having good feel to hold it on hand, but looks just like any other Sony smartphone released in the last three years.
like in other sony phones, The front and back sides are very flat, while the sides are rounded with prominent corners. And it made of mostly from plastic, which means it feels less fancy than any other phones at this price.
It has the waterproof which is an advantage to buy this phone.
The display is so good and bright with more colors. The videos are playing like a gem.
Just like any other sony phones, Both front end and back cameras are superb, speakers are so vibrant and noise-free.
The battery is just 2600mhs which seems very low for a high-budget phone. The battery life is being claimed to be two days, but, it seems it is not upto that level, it drained fully with in a day for an average usage.

Sony has made a new model at the top of its M class of smartphones, the Sony Xperia M5. It looks very similar to the Xperia Z3+, but is not quite as well-equipped on the inside. Its standout feature is a very promising front-facing camera, nothing else.
Sony might have given the Xperia M5's appearance just like any other Z series device, but the frame is made of plastic, not metal, leaving the M5 feeling cheaper than the Z3+. The build is, however, completely waterproof and dustproof.
The display is excellent and clear, and reproduces colors brilliantly. The contrast and color range are extensive and rich and the image quality comes close to UHD screens. It is having a 5-inch IPS panel with a full HD resolution of 1,920 x 1,080 pixels and a pixel density of 441 ppi. It exceeds the average resolving power of the human eye :).
Unlike the Sony's Z series, the Xperia M5 does not come with headphones. The in-built speakers are are very norma and offer mono rather than stereo sounds. The maximum volume is also quite low.
The Sony Xperia M5 cameras are clearly its strong point. The main camera delivers high-contrast, sharp images in 21.5 MP and the selfie camera produces pleasing wide-angle shots in 13 MP. The quick-start function can be used to wake the phone from standby and go directly into the camera app. However the shots were not quick sometimes.
And the phone has 2,600 mAh battery, which is about average for a five-inch smartphone. I don't know why Sony is still keeping the battery power low in their devices while the screen size of them are increasing in every new models.

The phone is good and the build is usual good.
The camera is pretty good.
The thumbprint scanner on the power button saves time and giving more security, the weight of the phone is perfect – not too heavy, not too light – and the camera is superb.

It's amongst the best big screen phones I have come across.
The phone display is pretty awesome and having great display and clarity.
The brightness is pretty nice, and Adaptive Brightness feature seems to work better
It is a delight to play games on this huge screen but its bit hard to handle the screen with one hand.
The rear camera is as usual good and front facing camera is one of the best I’ve seen on any smartphone. Surprisingly, front camera sports a wide-angle lens but rear does not.
The audio quality is supreme. No doubt sound is powerful enough, all thanks to stereo speakers! Also, the sound quality is crystal clear, and no distortion was experienced.
The battery is pretty good and can be used upto 2 days for a normal use. But It has a little bit of heating problem while playing heavy games.

The phone is very good and having very large display to be noticed wherever you go :). The display has good viewing angles and is very bright.

The phone has 16GB of internal storage, out of which only around 10 GB can be usable.

The speaker is above normal and not that much loud.
The rear camera takes good-looking pictures with largely accurate colour and front-camera as well good, able to take great selfie.
The battery life is admirable good even when the phone is connected to 3G/4G networks and functioning as a hotspot. I am extremely happy with the battery life of my phone.

The Xperia X is a mid-range handset that Sony is selling to capture its mid-range mobile space:

Design:
The design isn't all that dissimilar to the outgoing Xperia Z5 family. The X has a metal-looking frame with a glass front and a simple slab shape. If you've been paying attention to the evolution of Sony's stark design language you'll immediately recognize the Xperia X as a Sony. Perhaps the biggest departure from the old Z series is the X's use of metal for the rear panel rather than glass, and the use of polycarbonate for the frame rather than aluminum. These changes don't impact the look all that much, but they do alter the phone's experience dramatically as far as hand feel is concerned.

The Xperia X is a compact device. The 5-inch screen allowed Sony to keep the overall dimensions in check. The weight is comfortable. I found the device enjoyable to use for several days. Most people should be able to hold and use the phone with one hand, meaning the device will work for those who have smaller hands. It fits in pockets no problem.

Screen:
Sony gave the Xperia X a fine display. It measures 5 inches across the diagonal with full HD (1920 by 1080 pixel) resolution. The LCD panel includes Sony's TriLuminos and X-Reality technologies to improve color and clarity. The colors certainly pop, and the display is bright enough for indoor and outdoor use. I think the size and pixel count provide more than enough clarity and can't say whether or not X-Reality helped improve it. The display offers fantastic viewing angles and avoids fingerprints like the plague. It's a good screen.

Sound
The X is an acceptable voice phone. Sound quality through the earpiece is pretty good. Voices are warm, but sometimes prone to distortion. Volume is just barely adequate. The X is loud enough for use at home or the office, but hearing calls in the car or on busy city streets was difficult. People I spoke to through the X said I sounded “just okay.”
The speakerphone is close to useless. The quality drops noticeably, as most calls are riddled with distortion. Setting the volume up all the way won't help you hear calls in your car, or other noisy spaces. It's simply not loud enough

Battery:
The Xperia X ships with a 2,620 mAh battery that has a few tricks up its Lithium Ion sleeves. First, the battery lasts beyond one-and-a-half days. The Xperia X often pushed beyond lunch on the second day. Few phones deliver that much longevity from this size battery.
Second, the battery charges quickly. For example, 10 minutes plugged into a charger will add 5.5 hours of life to the battery. The battery takes well under two hours to recharge fully from 0%. We can thank Quick Charge for this rapid-charging skill.
Third, Sony is making use of technology from Qnovo to extend battery life; not daily battery life, mind you, but the overall longevity of the battery itself. It uses adaptive charging technology and can prevent the battery from losing capacity over time. In other words, after a year of daily charging cycles, the Xperia X battery should have a higher percentage of its capacity still available than most other batteries.
Last, the Xperia X includes three power management tools: Battery Saver Mode, Power Saver Mode, and Ultra Power Saver Mode. Between these and the already-very-good battery life, you can't get away with telling so-and-so that your phone died and that's why you didn't respond to their text.

"The design of the phone is one that feel solid and powerful in the hand, The overall look and feel is one of higher quality, but the boxy design is not impressive as all the sony phones comes up with the same design.
Camera performance is magnificent. Whipping the phone up and down and taking random photos of objects constantly offered a clear and in-focus picture, way beyond anything I've seen on a smarphone up to this point.
The battery is good, can be last upto 2 days for a regular use.

Sony's newest flagship-class device is the Xperia XZ. This phone builds on the design and features we saw in the Xperia X earlier this year and makes strides with the camera and video camera tools. Here are our first impressions.

Under the hood, the XZ has flagship-class specs. The XZ is powered by a Snapdragon 820 processor with Adreno 510 GPU, 3 GB of RAM, and 32 GB of storage. The main camera rates 23 megapixels, and the selfie cam rates 13 megapixels. It also has a 2,900mAh battery with Quick Charge and CAT9 LTE.

The Android 6 Marshmallow platform carries the usual Sony UI skin. Perhaps most importantly, Sony improved the camera software so it is simpler to dial in the different shooting modes and settings. I like how quickly you can shift between normal and pro modes, as well as tweak things like exposure.
The Xperia XZ is the natural evolution of the X family we saw earlier this year. It is a flagship-level device in terms of specs and performance, but the design and display could be better.

The device still has the distinct four corners that Sony's devices so often include, which may make the phone uncomfortable in your pocket.

The device has a polycarbonate frame, 2.5D glass, and a metal rear panel. Sony calls this metal "alkaleido." It's some sort of hybrid. Pay no attention to the silly branding. I like the feel of the frame, which is smooth and seamless as it runs its course around the outer edge of the XZ. The 2.5D glass fits into the frame nicely. I'm not 100% pleased with the way the metal panel fits into the frame. It's better executed than the X Compact's plastic rear panel, but it's not a perfect fit and gaps are apparent. Worse, there's a piece of plastic filler at the bottom to allow radio signals to pass through. It just doesn't feel well thought-out.

The front face is all glass. I like that there are no buttons; the XZ uses on-screen controls. Some people may be displeased that there is no fingerprint reader and I am one of those people. A fingerprint reader has become table stakes for a flagship device and Sony's excuse for disclosing it is weak. (An exec told us it just couldn't make it happen right now.) Like the X Compact, the XZ has to slits carved into the glass for the stereo speakers. The user-facing camera and sensor array are positioned on either side of the earpiece grille.

The 5.2-inch 1080p HD display is fine, but didn't take my breath away. It is bright, colorful, and clear. Many other modern flagships have quad HD screens. Sony said it is skipping quad HD screens and will eventually go straight to ultra HD (4K) once they make more economic sense.