All that aside, the bottom line is simple: the iPhone 5 is over-saturated compared to the majority of displays (TN and IPS) that I have seen my photos on. I'm not printing my iPhone photos for a gallery viewing or anything, haha...they're mostly for family, Facebook, Twitter, forums, etc., just stuff that's viewed online on normal monitors.
We can get nit-picky about going nuts on calibration and whatnot, but that's missing the point - the point is that the iPhone 5's screen is over-vivid compared to regular computer monitors, so you end up with a duller image on a computer than you do on the phone. My 4S isn't a 1:1 match, but I get a much better idea of what the picture will look like to the average user than I did on my 5. For example, I'd get an awesome-looking sunset tweaked out in Camera+ on my iPhone 5, post it online, and it'd look...dull. So I'd have to over-saturate it on the camera and then upload it in order for it to look good.
That's all. I think the screen looks great - really bright, really vivid, just kind of a bummer for getting a fairly good idea of how a photo will look on a regular computer. It'd be great if they could tie in a calibration system for the iPhone, I'd totally snag that!