LaFoto, I'll have to try your approach on uploading.
I'm guessing that I know why it may look sharp. This was resized to 18 X 24 (inches, I can't translate to metric) with the thought of making an enlargement as a gift, provided it didn't get crummy reviews here. I've learned that proper sharpening at a smaller size isn't right for such enlargements, so it was sharpened after resizing. It looks fine in a letter-sized print but it could be that the sharpening for an enlargement doesn't work properly at this size. Live and learn.