I have had my 5 for a few weeks now, so i will chime in:
1st: if you have a 4s and are debating upgrading, stop, take your $200-800 (whatever your cost to upgrade) and go to the track, or play the lotto. The size and minimal weight difference are not worth the upgrde.
2nd: if you have smaller hands this phone is difficult to navigate basic things like mail, aka: you will need to change the way you handle your phone a bit
3rd: scratches to the body and glass are much easy to do, so handle with care. Where the 4 & 4s seemed a bit more indestructible, the 5 is not so much, get a case, get a screen protector asap.
4th: This feels nothing more than incremental, if my national exec did not deliver the phone to my desk to play with I could never see a legitimate reason to upgrade.
Current: 1978 308 GTB (25823)
Other: 2011 Audi A6 Avant