Hi Edwin and Welcome!
I agree about your comments, although I own it's faster predecessor: the FA* 300/2.8. I've seen many excellent images with the DA* version, although it's hard to tell if a re-sized for web image is really sharp (no slight against anyone, just a fact).
As Russ knows, ultimately for me it's the final image, although I've taken some serious heat for stating that Canon or Nikon are not the only possibilities for wildlife work (for the price range of the K20D - unless you buy their pro bodies, which are generally class leading AF and FPS). Many other cameras and brands will do quite well in the hands of a skilled photographer.
@ David W.:actually you can use a 300 for wildlife work, but different technique is needed, and I've used it successfully. The only tough subject is small birds, for obvious reasons. Sometimes even 500mm is tough with the smaller subjects. BTW, where are you in the Ottawa area? I lived at several locales on both sides of the river during my 22 years there... Vanier, Ottawa, Aylmer, Kanata... I wish I could go nordic skiing again - went up to visit family at the end of January...
Cheers,
Marc