Quote Originally Posted by neuroanatomist
Hmmm...the Tamron is definitely sharper at the wide end (even with both lenses wide open where the Tammy is a stop faster). At the long end, they aren't really different at f/4, and the Tamron @ 200mm f/2.8 is definitely softer than the Canon at 200mm f/4. Also, note that Bryan tested two copies of the Tamron 70-200 f/2.8, and copy 1 (which your link uses, Jan) is sharper than copy 2 across the range - except at 135mm, where both copies of the Tamron fall apart at f/2.8. (Of course, there are copy-specific variations in Canon lenses as well.)

Haven't seen the 2 copy-thing. Also haven't read the review so I don't know all specific details on it, but I was still amazed when I saw the initial ISO-chart [] I always thought my old 70-200 was super sharp at f4 [A] anyway I was always pleased with the sharpness it delivered. Great lens!