Engadget's review is saying the HTC one takes superb pics and the fact of getting past the 4megapixel count will be a non issue...I'll leave that up to me though when I get a hands one. IMO its the person taking the photo that makes the difference, not necessarily the camera it self.
I can take great pics with my nexus 4, does it have the best camera on the market? Not by a longshot...However I'm still able to grab really good pics when people I know with the same phone or even an iphone 5 can't top the same pic at the same time standing right next to me. Theres more to taking good pics then just having a ton of megapixels!