The Xperia Z runs a mildly altered version of Android, has a huge, super-high-resolution 5-inch screen at 1920 x 1080 pixels. The screen is crazy. Easily one of the best screens I've ever seen on a phone, especially in the deep, seductive blacks, dark and still like a desert night. (We are in the desert right now.) The phone is also very very thin, at 7.9 mm, and nicely squared-off. It's super light as well; even though it's made of glass, it feels as light as a plastic Samsung phone. The back panel is tempered glass, which the Sony rep insisted would not break, even after I aggressively thrust my broken iPhone 4S into his face and shouted "THAT'S WHAT THE LAST GUY TOLD ME!"