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-Well, I have an original non IS f2.8 in my arsenal. I haven't played with the IS version (sorry, I'm not a fan of IS). I have had a quick play with the f4 variant and it's pretty good.
Optically, the non IS f2.8 is by all accounts, slightly sharper than the IS version. f2.8 on the f2.8 lens, vs f4 on the f4 lens is always going to be a tad bit softer, that's just the way it works. At f4, I bet both are pretty much similar in sharpness levels. I could look at the MTF graphs from my Canon EOS lensworks book to make sure if you really want ;-)
The 70-200 f2.8 has long been regarded as one of Canon's very best lenses and I'd agree with that. It's my favourite. It's pricey, but it's very well built, very fast AF, silent AF, wonderful bokeh, very sharp and reliable. It's a pity I don't have a car Chris, otherwise I'd drive out to visit you and you could play with my lenses on your 450D.
Dave
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