i have a 70-200 f4l and i absolutely love the iq of the lens. my only grouse is its speed. it needs adequate light to have lower shutter speeds, hence making it difficult to use it indoors or at dawn or dusk without a tripod.
whatever extra sharpness f4l offers is again negated by slow speed and OTOH, 70-300 IS provides the extra 100mm (though not very sharp - from what i have read) and an IS coupled with light weight enhances its usefulness in practical situations.
secondly, reviews says that there is not much of a image quality difference between the two lenses.
regards
tifosi.
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