I think all of the available macro lenses seem to be OK optically so it's down to how it handles as much as anything. So you've got to try them to see which you like best (you knew that, anyway, didn't you!)
On a similar thread over on BF I said don't forget the Sigma 150mm lens - my mate's got one and I haven't seen a sharper lens. Being a new model, it has digital cameras requirements to the fore in its design rather than just new coatings on the rear element plus the Sigma HSM with full time manual over-ride
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