Everyone -- just tweeted out to @RogersHelp and they're claiming no other reports of battery drain issues -- just pointed them to this thread. There is a definite battery drain issue -- seeing the same problem. I've reset the phone (not from backup), wiped cache, tried a battery re-calibration (as per AndroidPit) and the issue remains. There is a definite change in battery consumption since the update and we need to really hit this home to Rogers.
I noticed that other carriers in the US pushed out the Marshmallow update with many complaining of battery drain issues - they then followed it up with another update and it seemed to clear the problem. Hopefully Rogers can do the same very soon.
I have been following the thread on battery life after the update and thought that I would share my experience.
I updated my Rogers Note 5 the morning of May 31st.
Prior to the update, I would get through a full day (18 hours) without any issues, and with 25% left at the end of the day. My typical use pattern is business (email, calendar, docs, etc.), text messaging, Hangouts, Twitter, general browsing, Flipboard, and a bit of LinkedIn. I typically have 3.5-4 hours of Screen on Time (SOT) per day. I am not a gamer and do not have any games installed. I have disabled all notifications other than for the use mentioned above (with the expection of Twitter and LinkedIn notification being turned off). Lastly, I do use Knox.
The first 3 days with the update were a little rough. With the same usage characteristics, the battery lasted only 14 hours before it was totally dead (vs. 18 hours with 25% left).
The past two days, battery life has improved to the baseline prior to the update. Perhaps it takes a few days for Doze to kick in, or maybe Samsung's app optimization is reset by the update.
I did not clear my cache after the update or do a fresh install.
Anyhow, I hope that this information is of some use.