"Cameras do not matter"is stupid,.....Lenses do not matter,.... is even worse.
If you do not have 1000$ to spend on a good camera but you have 500$ to spend on a G15,.....you are indeed accomplished in,... not being very bright.
Well, I depends on what you are doing. Sure, there are some limitations for cameras, the smaller/cheaper the camera, the bigger the limitations. But once you are up in DSLR territory, the differences are getting quite small. If you are not able to nail the composition with a EOS1000D, then you also won't be able to do it with a 1DX, it is as simple as that. If you have the skills, than the picture taken with the 1DX will definitly look better than the one with the 1000D, but the marging will not be that big, especially compared to the difference between the picture taken from a skilled photographer, to the one from an unskilled.
And well, I think Danica Patrik in a Cavalier would drive circles around you on a difficult track, no matter in what car you are sitting.
The eqiupment should always fit the skills of a photographer, and the only way of a photographer to improve his skills is taking pictures, and looking at pictures, and definitly not with buying more expensive gear.