New Sigma 180mm macro
Focus speed is noticeably better than the 150mm Sigma I had before (the non-stabilized version.)
Just in case anyone is interested the newer Sigma 150mm OS also AF's much better than the older non-stabalised one. It is easily the best AF I have experienced in a macro lens (I've owned the Tamron 90, Sigma 105, Nikon 105VR and Nikon 60D as well as both versions of the Sigma 150). For very close macro I use MF.
The bokeh is WAY nicer than the 150mm, which could tend to get a bit crunchy in the transition area from in focus to out of focus.
I'm a little bit suprised to read this because I always liked the bokeh on the old Sigma 150, just as I now like the bokeh on the 150 OS. I have some good lenses to compare them to aswell.