Not all of Canon's L series lenses use Flourite I might add, only the really long lenses (500mm f4, 400mm f2,8, etc). Most of the cheaper L series lesnes use LD (low dispersion) elements. I have several versions of Canon's excellent "Lens work" books, which describe Canon's lenses in detail ;-)
L series glass, as H & Troy have said, is WELL worth it. Far better from an optical point of view. Generally, the USM motors are better too. And so is build quality. The extra money is worth it imho.
Dave
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