The version leaked is for the western LTE version of the handset (C6603) rather than the NTT DoCoMo version (SO-02E). It comes from a supposed retail device running 10.1.A.1.350 firmware (Android 4.1.2).
A system image of the LTE version of the Xperia Z, has been made available for download courtesy of hush66 from XDA developers.
if you’re interested in checking the system out in its entirety, you can grab the full dump at the source link below. They’ve also taken the time to separate out the system apps and sound files. How sweet.
The entire system dump file is available over here and those into cooking custom ROMs might find it worth leaks. Meanwhile, regular users might be more interested to also find out that the same user already successfully extracted the ringtones, notifications, alarm tones and wallpapers from the Xperia Z.[[Source]]