Chris, I have done heaps of research on nearly every canon lens available and have come up with two zooms, one is the 70-200mm IS USM F/4L and the other the 70-200mm F/2.8L IS USM.
Both of these are the pick of the crop if one is looking for a moderate length zoom lens, and both are just superb, both in build and optical quality.
My choice would be the F/2.8, and if this one was used at F/4.0, you would not get a better lens in the zoom range.
Of coarse the fixed focus Canon line are the top of the line, but highly expensive.
Leon
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