Bruce, is the lack of sharpeness visible only for photo work and ok with video? If it's the case, could you please elaborate on the focus ring of the Sigma? This focal lenght is really what I am looking for. Is the focus ring is good for manual focussing? how it compare with the focus ring of the 50mm 1.4?

Thanks,

I only did one video test in a low light situation, and the focus looked good. The real difference was when I shot the pictures with each lens. Unfortunately, I returned it before trying it out in a real life job situation.
My thinking was that I have the other lenses, and though I'd love to have the speed, I'll wait and see.
Bruce Yarock