Thanks for posting this. Personally, I think they are nuts to bring out a 50mm lens.
Myself, I would hardly ever use a 100mm FL.
If it were a 25mm, maybe but to start with that...we'll see.
Are you getting one Sabesh?
NOKTOR - Ultra Fast Lenses - Products
Image quality is pretty good for the speed & price. Nothing really competes on the value side of things. If you don't need/want the speed then look elsewhere.
Vignetting doesn't seem too bad wide open which is a real surprise and the bokeh seems good.