105DC vs Sigma 85 on D700

I am looking for a portrait lens for my D700. I surveyed on many threads here, and other webs, finding people having difference of these 2 lenses on different camera bodies, especially for 105DC, the AF of camera bodies making difference, so I post my thread here. My shooting preference is around 90-100mm, so either one should work for me. Please advise, if you have D700+105DC, or D700+Sigma 85, thanks.