this is funny...
it is NOT all down to the person taking the photograph, because if all I want is a picture of a cup of coffee on my desk, then the 5mp camera on my surface is going to produce a significantly poorer output that the 8.7mp on the 920, which will be significantly poorer than my 18mp canon 7D.
Yes, I've deliberately gone to extremes, but I find it amusing how people say they're all the same, it's all down to the user - you just cannot make that definitive statement - it's a combination of user and tools.
Now, if you are looking for composition and subjects, then of course the persons skills do come into it, but if the same person takes 2 photo's, 1 with each phone then the question IS about the better camera.
There are dozens of comparison pics out there, the 920 camera is certainly the better camera, pre and post amber.