Your screen shots are labeled A,B,C,D. I can not relate this to 2001,2006,2009,2011.
A (bottom right) stands out by the sharpness of the background. Obviously due to smaller aperture, since sharpness in front is roughly the same as on the others.
B (top right) has a purple cast, compared to the others, and falls out by that
C (bottom left) and D (top left) look pretty much the same to me.
I would be curious which one is the 5D2...