Loving this lens so far. I have put up a full review with a bunch of sample images of Australian wildlife.. Enjoy :) http://www.davidromaphotography.com/blog/2014/12/sigma-150-600mm-f5-6-3-dg-os-hsm-sport---australian-hands-on-review-with-sample-shots
Excellent build quality, 600mm wide open is very sharp even handheld; stabilization is quite effective, I quite like the push pull
It is rather large and heavy; But that is to be expected at 600mm and I was able to hand hold it with no issues; The minimum focus distance leaves a bit to be desired when compared to the Canon 100-400mm