Interesting article.
It is too soon for any realistic battery usage reports, but some real world experiences will be interesting. For me, that is a couple of 5-10 minute calls, periodically checking investments and Twitter, and reading a couple of emails. I can easily run 12-14 hours on this load without killing the HD battery of a 4 year old MOT Droid Bionic.
Everyone's needs are different, so I'll settle for a comparison chart of something like the S6, S6 Edge, HTC M8 and M9, and the iPhone variants. Run a standby test, playing a video, etc and so forth.