Mitakon 50mm f/0.95
Although this was a pre-order it was the 2nd version of the lens. Labelled as: "The Dark Knight, Speedmaster". This was the earliest super fast 50mm lens.
f/0.95 - 16
Unfortunately I owned this lens before I tested lenses accurately, but I can assure you that it;s one of the worst I've seen, so I have marked it as 1/10 on the main page. It's pretty sharp and very much so in the middle. The above sample, shot at f/16.