After backing the original kickstarter I ended getting the mkII (Dark Knight) version which had questionable build and stiff focus / aperture rings and hood. The mkIII version (tested here) is considerably better build. The image quality is good for such a fast and relatively reasonable price super fast lens. It seems like the IR quality of the mkIII is better than the mkII based on my experience so far, but it's probably too early to say for sure.
f/0.95 - 16
10 / 7
This sample (f/16) was taken on the mkII version.I should try to replicate this scene with the mkIII.