As others focus on phablets, Sony showed the 5" market a lot of love with the new Xperia X series. The Xperia X Performance is essentially a Z-phone in disguise. Better yet, not even the Z5 has a brushed metal back.
This one has it all - waterproofing, stereo speakers, a Snapdragon 820 chipset, 23MP worth of still images, the works. If money is no object, this would be our pick.
The Sony Xperia X is the middle sibling. The same metal exterior (without the brushed finish) and 5" 1080p screen, the same still resolution and stereo speakers. It's just not waterproof, though, and the chipset is a Snapdragon 650.
The Sony Xperia XA is for the price-conscious. It still has a 5" screen, but of 720p resolution. No metal finish, no stereo speakers either. The camera obviously took the biggest slash, a 1/3" Exmor RS sensor of 13MP resolution.
Re the issue of phone screen going dark during call, is your phones light sensor at the top of screen blocked? I had the same issue when I used a camera cover on the selfie camera (I don't take selfies), which accidentally covered the light sens...
please help me, my Sony Xperia X Performance goes dark on every call and i don`t know how to rectify this and it is frustrating because sometimes the person on the call asks me a to press a digit but then the phone is dark, please assist!
My Sony Xperia X F5122 released in 2016. It's version, 6.1which I updated from the Sony website and its version 7.0 naught. It is very latest and best. I am very pleased with this product.