Sony Mobiles is rolling out Android 5.1.1 Lollipop firmware update to its high-end devices. The update carries the build number 23.4.A.0.546, which represent Android 5.1.1 Lollipop is currently rolling to Xperia Z3 Compact (D5803 only) and Xperia Z3 Tablet Compact (SGP612) at the time of posting.
Currently the update for Xperia Z3 Compact is live in Baltics and Middle East for generic firmware. Italy Xperia Z3 Tablet Compact users are first to get the Android 5.1.1 update.
Check out the below source link for list of FTF firmware files for each variant. If you have already updated your Xperia device, then do share the changes you feel when compared with Android 5.0.2 Lollipop firmware.
Sony Xperia Z3 Compact Android 5.1.1 screenshots (23.4.A.0.546)
Thanks to XDA, who has posted the screenshots of Android 5.1.1 firmware-