Most of the improvements in kitkat are supposed to be under the hood. I've noticed on my HTC One phenomenal improvement in battery life on 4.4. I'm excited at the prospect of similar improvements on top of the already great battery life on the Maxx.
Anyone noticing any differences in battery life with 4.4?
No. If anything, battery life is slightly worse for me. (I've had the update since the first soak, so almost a month now.) I did a factory reset and there was no difference. What's weird is that battery life changes day to day. Yesterday was very good - I went to bed at about 60%, which was typical under JB. Today my phone is at 81% after 5 hours. I'd say that I have seen anything from the same as before to as much as 1% worse per hour than before.