Took a trip to Houston Camera Exchange the other day, found this cool Summitar for sale and took it home. Mounted it on my M3 and M Typ 240 and made me giggle, this thing is fun!
So went walking around and took some photos, I can say that this lens is sharp at f/4 and glowy at f/2. If you apply some sharpening to the DNG files, you can get it to look very sharp. Only thing may bother you is the center that looks weird in some images at f/2 but may add to the feel of a vintage lens.