The battery is larger, the screen bigger and brighter, the processor quicker and the design altered.
The spec sheet certainly doesnt let it down: a 2.5GHz quad-core CPU, 2GB of RAM, a 2800mAh(removable) battery, 16 / 32GB of memory(with up to 128GB extra through microSD), one of the worlds most vibrant screens thats been extended to 5.1-inches and added biometrics.the camera shots very clearly nd hd photos the picture quality is very brilliant.