hey,
the lens renders beautiful colours especially on slide film. weight is not too heavy like the canon 0.95 or noctilux. built is first class better than leica's. basically a classic render lens with modern coating. a keeper. but with a diameter of 62mm.
note, look for later batch, the earlier 3 digits back focuses on the m8.
I owned 3 and they r great to keep and easy to sell. a very nice piece of Japanese lens.
hope this helps.