I'm at 4 hours 45 minutes with 41% left on a not-too-heavy use day. I have about 40% brightness, switching between Wi-Fi and LTE all day, and Bluetooth is off. It's on track to get 9 hours of battery life per day which is plenty for me.
No complaints. Even if it was bad I still wouldn't complain. I'm iffy about my ringer switch but not making an appointment yet. Every time I feel like I've found a flaw I just look at this beautiful screen and everything else seems to go away. I mean really, the resolution and the curved glass, it's all just perfect. Makes me want to cry. I got an iPhone 6 64GB.