Compared to the Z2, Sony has made some minute changes in the Xperia Z3. We?re looking at a slightly upgraded Snapdragon 801 SoC, a marginally smaller 3,100 mAh battery, a thinner design, and a few software tweaks. The camera and display are essentially the same. It's clear Sony has been tinkering with the perfect smartphone formula, and while those on the six-months-old Z2 can probably skip this, it might make users of competing phones consider a switch.