I am happy that you enjoy your lens. I, in contradistinction, am using a crop (7d) - though. I think there are many who would be happy with the 100-400 on the crop as well. Just trying to get some perspective. Thanks!
There's something about the way the 100-400 plays with the 7D. It's an amazing combination.
Every now and then I consider selling off the 100-400 and picking up the 70-200/2.8 II as I only use the long end occasionally. Then I shot it for a little while and the images make me smile and any thoughts of selling it go away.
I am not familiar with the Tammy as I've had my 100-400 for quite some time and the Tammy is, as you know, new.



