Sony Mobile updated the camera UI for the Xperia Z5 series earlier today with the Camera 2.0.0 update. So far, the update is only live on the Xperia Z5, Z5 Compact and Z5 Premium, but the APK will also work on the Xperia Z3+ without modification.
However, if you own an earlier Xperia Z series model with 20.7MP camera, then you’ll be glad to hear that Camera 2.0.0 has been ported (as long as you have root). The Xperia Z5 camera port will work on the Xperia Z1, Z1 Compact, Z2, Z3, and Z3 Compact. To install, hit the source link to download the zip file and then flash through recovery. There are still some bugs being ironed out, but keep an eye on the source link for future updates.