Something that kind of bothered me... I shot that ewe picture with a 100-400 f4-f5.6 lens L lens. See how the background is not completely blurred? Had I used an f2.8 lens the background "bokeh" would have been completely blurred and what they call "creamy" and her head would have popped out of the photo more.
Additionally, the copy of the lens I was using was not tack sharp. There is no definition in the hair on the ram, it sort of blends together. This is one way you can tell a good lens from an average lens. I have heard that there are sharp copies of this lens out there. The other thing I tried to do with the ewe picture is put her head on a power point.
Shawn