Image quality alone: 300/2.8 or 200/2

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Originally Posted by Jon Ruyle

The 200mm is amazingly hand-holdable, able to take a handheld picture in 1/6th the light of the 300. In fact, despite its long focal length, the 200mm f/2 is one of the most hand holdable lenses canon makes (a 135mm f/2 IS would be king of this, if only they made one)
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i think a 135mm f/2 IS would be the ultimate portrait photographer's dream, that would be an incredible lens