Edge test, 7D,300 2.8mm ll vs. 300mm 2.8 l
Optically? on a 7D cropped body. Not worth the upgrade period.
That seems the case. The old one is still really good in the center, and the 7D never stray too far from the center. One of test sites shows more contrast on the 2x III though.
Having said that, I've seen the price of the newest 300 is starting to drop. With the old 300 still commanding $4K, I would probably personally buy the new version if I were to buy one today.
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