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.
My New Avatar is in memory of Nancy my darling wife of 10 years who passed away on Monday November the 16th 2009 after an illness
My photo gallery http://thekiwi.org/photography/index.php