I've been noticing the last couple races that photos taken with my 1D MK III seem to have this "orange peel" effect to them and trying to figure out if its some form of noise, user error or some weird phenomenon deal. It is more noticeable after adding sharpening and when zooming in on the photos. I can really tell a difference when viewing a 1D MK III file and a 5D MK II file which has me to think maybe its something with the 1D's AA filter. 5D MK II files seem to be so much cleaner when zooming in. Could it be that I'm just pixel peeping too much? haha
Included a couple examples, I believe you should be able to download them from their links.
1D MK III
5D MK II