Sony has just announced that it has started rolling out the Android 4.3 Jellybean upgrade for the Xperia Z1 and the Xperia Z Ultra.

Below are the key features brought by the new firmware upgrade as listed by Sony Mobile:
As usual, timing and availability of the upgrade may vary by market and carrier. We have the Xperia Z1 on hand and so far Android 4.3 hasn’t arrived on our device yet.
To check for the upgrade on your Z1 or Z Ultra go to Settings, About phone, then Software update. You can also check through Sony PC Companion on your Windows PC.
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LG updates says:
🌱 Noobs🏆1
any news about LG updates?
rosenburg says:
🥉 Bronze🏆1
Sorry no LG update probabably 2015.
xperiaZultra says:
🌱 Noobs🏆1
got my Android 4.3 Update for Xperia Z Ultra earlier via Sony PC companion. No OTA update.
Bryan says:
🌱 Noobs🏆1
Got the update. There seems to be still a bug on the keyboard when I use the keymonk. Not much noticable difference for me.
Abed says:
🥉 Rookie🏆1
Still no 4.3 for my Xperia Z1 locked on smart. Gawd! I badly need an update.
Ton says:
🌱 Noobs🏆1
Same here, still no 4.3 update on my Xperia Z1 from Smart Postpaid plan. Is this has something to do with Smart lock?