2.7?
The Canon 100mm f/2.8 Macro is considered by many to be one of the sharpest lens Canon makes. As far as sharpness goes, the 300mm 2.8 is probably sharper, buts its not a macro, and its not cheap! (4k to 5k!). Plus its a whale of a lens..
I think you would be quite pleased with the 100mm.
johnny
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