Nice phone. But there are few problems that Sony needs to address like

1. Flaps covering micro-usb port and headphone jack. It's a nuisance to remove it everytime wanna charge and over time, the wear and tear effect will loosen it and the phone is susceptible to water. They can eliminate the flaps on z ultra, so i think about time they will produce a totally water proof phone.

2. Some users xperia Z complained that the glass glued to the back panel has become defective due to overheating and water can get into the phone. Damage is imminent
All of this flaws are only architecture mistakes.
I believe over time, they' ll perfected this. And we may finally get our perfect water proof phone. Although im now only using the inferior V, i totally like how Sony has done so much innovation