When you say full zoom a assume you mean zoom + digital Zoom as well if that is the case turn off the digital zoom don't use it editing software will do a much better job. I have a Kodak P850 IS as well as my canon 10D when you sharpened it you over sharpened just a little bit here is the same image I tried to clearthe halos (sharpening Halos) from around the bird and I cropped it a little more and cloned out the trees.
Birds high above in the trees Serenade the flowers with their melodies - Line from the song "A Lovers Concerto"
My photo gallery http://thekiwi.org/photography/index.php