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I only recently (last summer, anyway) upgraded my trusty 100mm 2.8 USM Macro to the newer L version, and I had to rent one twice before I could make up my mind. The IS is what eventually shifted my thinking, because the IQ difference between the two was virtually indistinguishable...Yet, I found myself doing more "spontaneous" style macro shooting, where I wanted to catch a butterfly on a flower or somesuch, a situation that precluded the use of tripod, mirror lockup, remote release, and all those painstaking tricks that produce perfectly sharp macro/close up frames...so, I could at last justify...Show more →
The 100 f/2.8 macro IS is a wonderful lens and with IS works well indoors. I find I can photograph people at very low shutter speeds because I can usually anticipate when they will be still enough.
The 85 f/1.8 is a good second option if, as you say, you like shallow DOF.