Ok. It seems to last just a little less than with 4.4.4. But maybe it's my imagination. Everything seems to move faster with 5.0 Other than that, I don't see much difference with the new OS. I do like the "recent apps" feature.
My S4 went from an average of 40 hours on a charge to around 30-35. So there is definitely a difference but I'm very peculiar about what happens in the background. It is a little disappointing considering Lollipop was supposed to be an improvement in resource management.