
Do you shoot in low light? Quite often
Do you use the lens professionally? Not often
Do you find that you need f2.8 any time? Yup!
If not you're probably not missing a lot.
To add - It's very heavy! Especially with a grip and flash on the camera too!
Regarding the weight I don't really have an issue with it anymore. I carried my 1D mk 2 and my 300mm f4 IS L around for a few hours with no trouble.
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Hoppy - You're a star! I never thought of selling the f4L IS!! I have the MkI 70-200 and would love the MkII..... I rarely use the 300 these days. THere's a thought!