That's the thing with a Jupiter-3.... No two are quite the same.
The 1967 J-3 that is used in #11 and 1956 KMZ in #12 are both softer, and have less harsh Bokeh.
The 1955 Black KMZ used here is the sharpest that I've seen. It is made from a 1955 KMZ with a 1980s front element, and set in a Black focus mount. I just picked up a Sonnar-C 50/1.5, and the focus is in exact agreement with this lens on the M8. I think that will be a good test.