Im thinking about getting this sigma 30mm for my canon 70D, what really interests me is that apparently, it gives you a full image on a full frame sensor with no vignetting past f2.0

I plan on moving up to an r6 somewhat soon, and Id love to be able to use this lens with an adapter.

My question is, while it will work, will the image quality in the corners be absolute dogshit, or will it be usable?

I havent seen any in-depth tests on quality, just that you get a full image and the autofocus works well