I don't have an S4/5/6, but you're not running "full" lollipop unless you're running Cyanogenmod or something like that.
For example, the whole lollipop "interruptions" control system has been replaced on my phone by the already-existing HTC do-not-disturb controls.
The reason I never got an S5 in the first place was because I read a review that said it was a great phone - ruined by shitty Samsung software. I wasn't really interested in keeping up with a rooted phone. It's against system administrator policy, anyway.
