Same as prince. They said the keyboard fix was for a potential problem that may have occurred if not for the fix. I've had my 5 since August, and have had only one issue. When on wifi, I would get pop ups telling me the app I was in was turned off for cellular. That baffled me for a while. I just turned everything on for cellular. But I think 7.1 fixed it. It doesn't do that now.
Can't really make out a difference, it seems good though, that said I never had issues with 7.1 either. I generally get less worked up over battery life. My 5 always brings me through my day and I would say I use it quite a lot.
iPhone 4 here, so some of the changes may not be apparent, though I understand this patch (sorry, Apple - 'upgrade') may have resolved some issues for others. That said, no noted difference in operation here.
Can't help they're just moving the deckchairs until iOS 8 and (hopefully) iPhone 6 are out, though.