The statement that the 70-300L isn't so good in low light may be true when the lens is attached to some bodies, but in my experience it works superbly when attached to a 6D (the same is likely true of other FF bodies); focus is fast and accurate, and the results look excellent even when the camera is hand held thanks to the first rate IS (provided your subject isn't moving around, at least). I would (and did) buy it instead of the 300mm f/4.
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