The only negative thing is the autofocus, which if it had, it would be excellent. Maybe this is also the biggest problem for a beginner, but it is something you get used to. The next thing that personally doesn't interest me is that it sounds, I would call it noisy. Not so annoying, but you can hear it... I wouldn't consider its weight as a negative, since it seems that the materials it is made of are of good quality, as well as its crystals.

The lens is amazing in all the tests I put it through. From portraits, photos in clubs, to landscapes, it is excellent. The only thing that requires getting used to is the manual focus.

Awesome lens for portraits. Good construction. Tremendous bokeh that easily compares to the Nikon 85mm 1.4.
The price is exceptional but it requires practice with manual focus, personally I didn't consider it a problem after a while.