When I learned that the Xperia Z3 was still working with my app I immediately bought one. Beautiful phone 
Now I updated the phone to Lollipop (which was an adventure by itself...) only to find out that my app no longer works. In contrast to Nexus 5 and similar phones rSAP is not disabled in the radio software. I currently guess it is an initialization problem in the RIL demon, but I don't have a solution yet. The problem seems to affect all Xperia Lollipop firmwares.
So if you have a Sony Xperia and you want to keep rSAP running, don't update to Lollipop until I fixed the issue.