It looks like Sony is rolling out its update to select versions of the Xperia Z2, , and . Specifically, it appears that the update is arriving for the D6503 version of the Z2, the D6603 Z3, and the D5803 Z3 Compact.
As noted by , in addition to general Marshmallow improvements like Doze, this update brings a new Camera interface to these Xperia phones. It also adds the February Android security patch to the devices.
The models in question were previously involved with .