Jill,
Inkista posted a some good comments as well in her last post. I knew the 60mm was sharp, but I never saw the MTF charts. The 60mm being sharper than the 100mm is news to me. Regardless, both lenses are very sharp.
Basically, it's going to come down to your budget and what focal length you prefer. I like the 100mm for the extra reach. I have a 85mm f/1.8 lens that I use mainly for portraits, so my 100mm is my "dedicated" macro lens unless I feel like using it for portraits. Also, inkista brought up another good point about full-frame compatibility.
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