I did recognize "Isaac" LOL Interesting on your results, Tim.
Interesting info. Not what I expected. We have the 70-300L Love it so much. It's incredibly sharp and decently fast AF (better than I expected for the 5.6 in lower light). I was wondering if we should move to the 100-400. Think I'll wait a while before making any decisions. Especially at the price. Thanks for your opinion.
My son has the 70-300L too and he participated in the comparison tests with me. He prefers his 70-300L, but feels that the rented lens was a poor copy and possibly not a good representative example of the new lens. The lens rental folks are going to check it when they get it back and let me know. Stayed tuned... 




But i am happy to share them, since you lot have been aware of him since birth 
