A huge difference. I don't know why I even bothered to post the images taken with my previous Mark III. This is as sharp as an image that I have taken with my 5D, or 1D Mark II's.

This is a Kildeer, and according to the book, they are not usually found near water. I've seen this pair along a gravel road for several weeks now, so I guess they are breaking the Kildeer rules.