Sigma SD10 for portraiture?
I am looking to digitally replace my Pentax 645n, and have been told only the Kodak 14n or the Canon 1ds will do. However, I've seen several samples of the Sigma SD10 with a macro lens (105mm) that look amazing. I shoot babies and young children, candid, mostly black and white- I need a fairly quick AF and something that performs well in low, indirect natural light. But mostly, I need SHARPNESS. It's why I moved up from 35mm in the first place.
Any thoughts?
Thanks.