Nice bird, does not seem out of focus but lack detail on the feathers and head, probrably from USM. Highlights and colors are fine. The background makes the image seem a bit darker to me then it probrably is.
The way you cropped it emphasizes the tilt the bird has. Maybe a bit more room on the left would have helped in that area.
I like the scale of the bird, I think you had the right idea just some unknown sharpening issues.