So it finally arrived today... and I love it! Couldn't take many sample shots with it outside (had no time). Maybe this weekend I'll go somewhere and test it out 500mm vs. my old 300mm. 500mm and 300mm extended. Sample shot, inside with low light @ 150mm, handheld Same thing, but @ 500mm, handheld. No edits done to photos. This sucka is actually not that bad to use handheld. I'm glad I got it over the Canon (I know it's not "L" glass, but whatever). I've been hearing too many issues with the push/pull system with the Canon lens.