The sensor itself is great, but they come with budget lenses. Not just optically mediocre, but they're slow, usually starting at f/4, so you're throwing a lot of that sensor advantage away compared to a phone with f/1.8.

I have a 3 year old print on my wall of my kids, taken with an iPhone 5, cropped from a horizontal framing to vertical, and then printed at 11x14". I did a bit of post-processing on it to sharpen it up, and it looks fantastic (until you look at it from less than a foot away). I need to repeat the process with the X's camera. ;)