Android Central review :

http://www.androidcentral.com/sony-xperia-xz

Conclusion summary:
Sony is almost back on top form. The Xperia XZ is a solid all-round handset that does a lot of things right — a handset to restore the faith of Sony fans. Its greatest sin is probably looking a little dull — this is no Galaxy Note 7, after all — but once you look path its monolithic exterior there's a lot to like.

Sony bucks the trend of 2K displays and instead goes with a fantastic looking 1080p panel, with power savings as a result. Performance is speedy across the board, and Sony's software is thoughtful and measured. And we're finally seeing a significant leap forward in camera performance in an Xperia phone, with big hardware additions that result in better photos almost every time.

The problem for Sony, like so many other Android manufacturers, is the fact that Samsung's absolutely crushing it this year. Sony's camera is great, but it's not the best. Same deal with its screen, its build quality and its battery life. And U.S. buyers once again get the short end of the stick, as Sony cheaps out on fingerprint security.

As such, the XZ's appeal is likely limited to hardcore Sony fans. And if that's you, then you'll be getting a hell of a phone.