Been playing with mine since yesterday afternoon.
First impression: compared to my iphone 4s, this thing is pretty huge. Likewise compared to the N4, 4s is pretty tiny. My hands are smaller than average so it will take some adjustment. The iphone feels more solid/dense, which could be taken negatively or positively depending on your perspective. Screen is beautiful, build seems good. Vibrate is stupid loud and cheap sounding, though this is not a big deal. External speaker nothing to write home about. Overall I love the thing.
Battery observations: Delivered charge was ~55%. From 55->95% was quick, then it seemed like it took 2-3x that time to go the last 5%. Maybe I was just checking it more frequently. Once at 100% I pulled off the charger and had it off ever since then. Current stats are 46% remaining, 18h27m on battery. Top offenders: Screen 23%, Mediaserver 15%, Wi-fi 10%, idle 10%, Pandora 9% (listening at work today), Cell standby 8%, OS 7%, system 4%, Maps 4% (?? I haven't even loaded this yet), NewsRob 3%. Screen on time: 2h11m. FYI: Google Now is thus far off. Spent most of my time on home or work wifi, other than a 30 min or so commute.
So far, very happy with the phone. YMMV.
EDIT: Other things to note. I have all haptic and sound feedback OFF. Also have auto screen brightness off with the level very near the low end, which is completely tolerable for me.
EDIT2, battery life update: 23% @ 1d0h40m. Screen on time 2h28m. Mediaserver has taken throne for usage of 32%. I presume this is due to several hours of streaming Pandora over wifi while at work today.
EDIT3: phone finally shutdown from low battery at about the 27 hour mark. Screen on time I'd guess was near 3 hours. Lots of Pandora over WiFi today. I'm very satisfied especially considering the battery may improve with conditioning