What impresses me most is the perfect level of sharpness, too often shots posted here are either a little soft or show marked effects of sharpening, but these are just about perfect. What settings do you use for sharpness, contrast and saturation in your DS. (No I am dot discounting the fact that you are using a fantastic lens as well).
Tom, you never fail to impress, the worst images I have seen you post here are merely fantastic, these go beyond that.
BTW the only wildlife pictures I have were taken with film or my Fuji S7000 so I cannot really post them here (great excuse to avoid embarrassment hey?