The leaks show that the Android 4.2.2 update has begun rolling out to the Xperia Z model C6603, which is the unlocked international variant of the device. We have seen confirmation from China as well as Spain that the update is making its way out to users. There are also leaked versions of the install image if you want to get them. But, the instructions to manually update are in Spanish, so you are 100% on your own if you decide to try that.
Links for all of that are at the source.
source: Tutto Android