He says something like "decent sharpness at f/1.4, pretty good at f/2-2.8 and then getting better and better." "The feeling and sharpness reminds me of an older 35mm Summilux" One of his friends doubts that it really is a single coat, maybe rather a simpler kind of multi-coating?
When it comes to colour film, he thinks the colour rendition is slightly colder than his 1980 35mm Summicron but equal sharpness. He doesn't seem to be able to tell whether the SC is better or worse than the MC.
Conclusion: "Works very well with my M6, a perfect street photo lens"