Works fine here, save for maps (which is widely reviled). My wife had a problem syncing her phone 'til she reset the cloud connection for her photos. Other than that, it's good to go.
I haven't even seen a 5 (that I know of) and I'm in no hurry to update. I have other things to spend my money on rather than a new phone. Still, there are some new phones out there that look pretty cool.