i've also used the 100 f/2 makro, and see no use for that extra stop of light vs the high end f2.8 primes, shooting macro at f/2 will get you nothing in focus, as usually shooting at 5.6-8 is necessary to get a mildly thin depth of field. Macro is usually shot even more stopped down (I'd use a strobe and like f/16+) where any differences in sharpness are basically negligible.
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