The 5DIII is a camera which is a generation ahead... therefore, the comparison has a significant variable. Also, the 16 being bigger in the 7D shot is a serious deal...
I agree that there is a generation gap between cameras but I somehow suspect that the gap is much bigger between crop & FF than it is between two FF bodies that are only 1 generation apart.
I'll agree with other posters that in good light... it makes little difference. I actually took some photos of a bright giant yellow Nikon logo at the store at ISO 6400 with the 7d and the image wasn't as bad.
My current dilemma... is the $1800 (more or less) difference between the cameras justified for a non-professional?