Xperia Z1 white balance

Other changes include improvements to Wifi, Bluetooth streaming and the stock email app 

Just a month after the Sony Xperia Z1 and Z Ultra were updated to Android 4.3 Jelly Bean, there's a second 4.3-based firmware rolling out to both handsets. Sony has confirmed via Twitter that the update is rolling out in stages starting today, with "display, BT [Bluetooth] music streaming, email, Wifi improvements," among other changes. The only real difference we've noticed on our European Z1 is the addition of a "white balance" option under display settings, allowing users to tweak the color characteristics of their screens.

The update to version 14.2.A.1.136 seems to be available only through Sony's PC Companion and Mac Bridge apps at present — presumably an over-the-air rollout will kick off in the near future.