The new Sony Xperia Z is an impressive device and the developers at XDA believe that the brand new launcher is worth sharing. The launcher has been ported to several high end smartphones including the Samsung Galaxy S III, Samsung Galaxy Note II, Samsung Galaxy S II and the Samsung Galaxy Note.The port isn't perfect and has its share of bugs. However you will be able to experience the Xperia widgets in various sizes. Your device will have to be rooted and have CWM installed in order to use this launcher
Download the Xperia Z launcher and flash it to your device using CWM Recovery
source – XDA Developers | GSM Arena