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I own the EF100mm and it is a great lens. It is good enough that unless you have used it for quite awhile and have some experience with macro photography it will take quite a while before you wished you had a better lens. The L IS USM 100mm is new and I haven't seen one. The DP review on it shows it to be an impressive improvement to the older 100mm. It isn't cheap and whether it's worth the difference in cost depends on your needs.
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