Okay, I've got a couple of other dumb questions. Was this linked from flickr, or your personal website? If flickr, what resolution (pixel size WxL) did you post it to flickr?
Okay, I asked only because flickr has this nasty auto-sharpening that they do as part of their upload. If you upload to flickr at 700 px or 800 px as I usually post here, the auto-sharpening wreaks havoc on the photo. But I've learned that if I upload to flickr at full-resolution and then share at 800 px, it's not really noticeable.