5S on iOS 8 beta 2, and I've had my phone unplugged since around 9 AM. Been streaming a bit of radio on 4G, taken a few phone calls, and been browsing the web from time to time. Normal use for me, and at 8:12 PM, 11 hours later, I'm at 57% battery.
Does Sammy even legitimately try anymore, or do they just take a random phone feature word and say theirs is better? People I work with have Galaxy S4s and S5s and they have to take all the plugs in the break room, while I'm sitting there with 60% battery after an 8 hour shift.