What a thread. We need to rename this to the Android Battery Life thread. 😛
My 6s+ had insane battery life. Asking about battery usage is comparing apples to oranges because some people will use the phone to game and others will use the phone to read books - one will get a lot longer battery life results than the other. Also, some may be in an area where they sit next to a cellular tower while someone else sits with 1 bar - again, both will see vast differences in battery life results. And again, someone like me in an office, I have brightness turned way down - versus someone who has brightness all the way up.
Just an FYI - comparing battery time can be apples to oranges. I can easily get 5 days on my 8+ with my usage (my work is a block from a Verizon tower). My wife usually ends her day with her 8+ at 30% but she uses her phone far more than I do (social media, chatting to friends, email for work, etc...).
The 8+ has insane battery life as well - being the + model it lasts a bit longer than the non+ model. Note 8 has great battery life - I've been impressed with what I've seen from coworkers who have it. Samsung has really perfected the standby battery life of these phones - though I've had a few complaints saying how they lost 50% of battery life overnight for no reason.