Sigma 150-600 mm Contemporary vs Sport Comparison

My good friend Greg Basco and I just published a field review comparing Sigma's two 150-600 mm lenses, the Contemporary and the Sport. You can find it on my website. Hopefully those of you with a passion for bird photography and a limited budget will find our observations useful. Those of you who already own big Canon super telephoto primes might also find value in it. Enjoy! I'll be happy to post additional information about the lenses on this thread if anyone has any questions.

Hi Doug
I recently got the Contemporary Lens to go with my Canon 5DMkiii. I am still getting used to it. I had a look at your blog with it's impressive photos. What are your thoughts on using the image stabilization at faster shutter speeds: 1/1000 or faster?

Mike