Sigma 85mm f1.4 focus

No surprise! That's why I would stay away from Sigma. Although their products are improving (internal and external design) in recent years, their reliability (especially in the aspect of AF) is still a matter of concern. To be honest, I will stick with Nikon AF-S lenses for the sake of AF accuracy and repeatibility. How many FLD and SLD is pointless if you cannot acquire accurate focus.