I've owned the One X for over a month now, and I can say the camera has not disappointed me.
The start up speed of the camera is amazing, roughly around 0.5 seconds or so, and another 0.5 seconds before I get my first shot. Even from the lockscreen to the camera is incredibly fast as well. Focus is swift and quick, and the 2.0 aperture really sets it apart from other mobile phone camera lenses.The angle is pretty wide, and I can manage to fit everything I want in a single picture.
Some photos might come out a bit noisier than others, but that's not really a big deal, as the built-in editing feature seems to do most of the job of fixing photos up in terms of noise, brightness, contrast, saturation..etc.
As with pictures with subjects in motion, I haven't really got around to really taking any action shots yet, but I have experimented with my friends. The subjects don't come out as clear and sharp, and still tend to look blurry, but its acceptable, depending on your needs.
Video shooting is a satisfying experience, colors are correct and vivid, and the playback is smooth as well. Even in lowlight conditions the videos look great. A feature of video shooting is 'Slow motion', and I got a few chances to play around with it. The effect is really really superb, however, the trade off of shooting slow motion videos is the quality. The quality gets turned down to a point where a face will get blurred, or focus will change on different subjects. Not sure why this happens, but still, shooting a video with slow motion effects is pretty fun for shits and giggles (can i say that?).
Anyways, here are some still shots I took, most of these are edited with a filter from the built-in edit feature I think..
Edit: In the third picture (pool playing), you can clearly tell the right arm is in motion while I snapped the shot. This is what I meant when I said the subject will still come out a bit blurry, but it isn't bad. Plus the camera still managed to capture the rest of the photo with great clarity.