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Is the f/4L worth the extra 100 dollars to have constant f/4 and losing IS+100m? I feel as if the IS would compensate for the lose of light for hand held shots especially at the further end of the zoom and keep it stabler than having a bit higher shutter speed and the difference between f/4 and f/5 in terms of DoF isn't much. Of course I realize the IS would only benefit your end of movement and you might not be able to get that extra speed you need to capture a fast moving subject. Just seems to me that the 70-300 is a better deal with more features and newer tech although the L lens might have better IQ.
