Hello all, Has anyone compared these lenses directly? I had the Sigma Art 35/1.4 and really liked the rendition it delivered, but I could not get consistent exact focus at open apertures on the D800 I had, and I thought it a little large/heavy, so I sold it a while back. I am game to try the Tamron if it delivers comparably to the Sigma. BTW, I had the dock and piddled with the Sigma focus calibration, maybe I should have piddled more. Focus was OK most of the time, though.