So for most owners, this will be the first update since build number 14.3.A.0.757. Interestingly, only the European/Asian LTE models have been certified , so this could end up being another specific region/carrier update. We’ll keep you posted.
Xperia Z1 firmware build 14.3.A.0.769 certified for C6903 variant
Xperia Z Ultra firmware build 14.3.A.0.769 certified for C6833 variant
Xperia Z1 Compact firmware build 14.3.A.0.769 certified for D5503 variant
Thanks Mladen and Starwalkerfenix!