I have had a variety of Russian glass, but the Jupiter is among my favorites. The Tair 135 f/2.8 was lovely but weighed about three times what it should have. [What do you want from a former Army reconnaissance lens?!?!?] The Helios 58/2 is always fun. I had a 44-2 and found it too wild in bokeh, but the 44-4 is a really nice compromise between character and smooth. I really like the Volna-9 that I just picked up recently when I go the Jupiter. By comparison, the Volna is giant, but it has smoother, sharper rendering and a reasonable close focus distance. It is likely better suited for DSLR than mirrorless, but a great lens.