If there is one thing I don't like about this phone it's the battery. As for reliability, I will say that I've needed to do a factory reset as the fingerprint scanner stopped working, HOWEVER, this could just be my own fault as during that time I was using shifty cracked/hacked apps. The display is a good size for me personally, although if you are not using the adaptive brightness setting, which alters the darker colors on the screen to adapt to bright outdoor light, the display can be hard to see at times. Personally, I've only experienced the phone overheating while messing with the various camera settings (like 4k and camera mirroring apps, not regular everyday settings). Overall performance is okay, you can run PUBG and COD Mobile fine but, due to the fact that this phone's exterior is metal and runs on the infamous Snapdragon 810 it can get quite hot in the hands.
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Fairly decent autofocus, okay quality, good colors, I will say though that it takes a little while for the camera to take a picture, but still decent at this price point. The camera, despite not being up to today's standards, is honestly not too bad. This is a pretty good phone for the money you pay.
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It took a huge chunk of time for the phone to Start if you Restart it or turn it on after you Shut it off. Sometimes you have to go through the settings in order to set your mobile service again. Random Systems also crashing randomly which is pissing. Turns out, by "Restrict" they meant reduce the usage of Data which doesn't even help. I thought by turning the Data Saver on, It will "Restrict" the apps from using Data completely. But its impossible to use it as its all in Japanese (tho I hope I could read read). I'm using the Docomo version which has other apps related to it (Docomo) in the phone. Its also really hard to find the Phone Casing/Cover (at least in my region). You can't change the "navigation button" (that 3 icon sitting at the bottom the the screen).
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Even though I thought that sorts of thing should've been within the package of buying the phone. The File Commander has Ad & keep asking me to get the Premium Version which costs money. I am using it right now, its hot and the battery is already 20% depleted from 100. Mine just gets hot as if I was gaming and also drains my battery even when I'm not using it. The Sony Z5 doesn't have an Optimizer/Cleaner which unable the user to stop any apps running in the background.