Upload & Sell: On
...I don't know about the 1.2, it's probably quiet and I'm sure the AF is better than the Sigma, but from what I read it isn't perfect. If I had the money I'd buy it regardless.
None of my lenses are perfect, nor am I. If you're looking for a perfect lens, then you should read the Alt forum for at least three years, and then buy it. The perfect lens that is, not the forum
P.S. then let us know the answer; what is the perfect lens?