Now use a Sigma 70mm, albeit on a cropped body. However the lens is a DG type and so will work on full frame.
It's not a fast focuser, but has focus limiter, although you are probably using MF anyway.
VERY very sharp lens.
Worth a look if thats the kind of focal length you are looking at.
Reviewed very well, and I can vouch for it's performance, on APS-C at least.
The Sigma 70mm macro is indeed a very sharp lens, but I would definitely buy it from a place that allows returns/refunds. My Sigma 70mm copy worked fine in viewfinder but would not auto focus properly in Live View mode on my Canon 550D body; incompatibility like this depends on the lens version/age/firmware and body version also, so it's hit and miss. Sigma service was no help and clueless.
I returned the Sigma and got the Canon 100mm Macro L, which is great also, especially IS helping a lot with hand-held macro shots, and the 100 mm focal length giving a little more working distance than 70mm.
On a tighter budget, a used Canon 100mm Macro non-L would work very well also.