It's hard to say at this time. I'm trying to keep my time on the phone to a minimum to see if the system 'conditions' following the update. Right now if I'm off the screen, the screen battery usage is finally droping... under 45%. Currently it's at 36%.
Prior, If I got on the phone for any length of time, the screen usage would increase from the 45% or so minimum, upwards to the 70% number... or there abouts.
This morning when I was on it hard, the overall battery percentage dropped quickly from 92% down to 68%... in no time. The screen usage was in the 80's.
As mentioned, under Lollipop, the screen usage averaged a low 12% or so. Very constant.
Trying to be conservative and seeing what unfolds.