Here are some reviews I found. Feel free to post any you find 
Engadget
Sony Xperia Z2 review | Wired.co.uk
Sony Xperia Z2 review | Phone Reviews | TechRadar
Sony Xperia Z2 Review | Stuff

Engadget
Sony Xperia Z2 review | Wired.co.uk
Sony Xperia Z2 review | Phone Reviews | TechRadar
Sony Xperia Z2 Review | Stuff