I got my One a couple days ago and I can't complain about a single thing. The camera on this is thing is pretty amazing as it is. Compared to the S4, the main camera has a wider lens and can capture a lot more of the same scene and the ultrapixel sensor allows a lot of light even at at the same ISO.
Here's some stuff for phoneography. Add to it or add reviews if you want
3 in 1 Fisheye Lens +Wide Angle +Micro Lens Photo Kit Set For HTC One M7
8x Zoom Lens (Universal)
Griptight GorillaPod Universal phone mount