Seems much better today. Pulled off the charger at 7cst and sitting at 72% right now. Did a conference call, read some news, updated star wars, bunch of messaging, some emails came in. So, moderate use and it isn't doing bad.
Same with my work one. Pulled off about the same time, looked at calendar a few times, bunch of emails and a few calls and it is at 91%.
Personal device shows 11 hours left at 72% and work one shows 1 day 9 hours at 91%. (I have a lot more going on it the background than my work one)
So, not much difference in the builds from what I can tell. Too early to get a great gauge though.
Edit: To be clear, both are 950s.