Canon 100mm 2.8 macro. Razor sharp and of a similar focal length.
a lot of people said the tamron is better than the canon. i have not had a chance to look at any comparisons but i will be soon!
A lot of people say the Tamron just can't be beat in sharpness period....best you can hope for is to come equal to it..lol.
I plan to pick up a Tamron 90mm f2.8 to use as my primary portrait lens and as a dedicated macro lens. (I shoot with a faux macro now). The Tamron is so sharp that I'll probably have to use skin softening on about every shot to make it look less "look at my pores..." but it's easier to soften a sharp image than to try and get a sharp image from a soft one.