The bird is lovely, sharp, well exposed, nice wing position.
I wish there was a bit more room all around, esp. to the left, but that might aggravate the main issue I have with the image, which you pointed out, the background. The high contrast of the leaves and white really draws the eye away from the bird.
Yes, technically a very nice image of the bird. Excellent sharpness and detail. I too would like to see more room on the left and, as you point out, the dark leaves compete for attention and are a real distraction.
I agree with the comments above (and yours). Distracting BG, and too tight in the frame...I suspect you were trying to hide a feeder at left? If it is a feeder set-up you could place it in a better location to give you a better BG. Techs are perfect though...and awesome details on the plumage!
I would prefer more space, i.e. a much less tighter composition.
The background currently kills for me the otherwise excellent shot.
Given quality and detail I would invest some time in fixing the background, unless similar ones with more pleasing background are in the bag.