> I like 7artisans prime

Just got their 10mm M43 (~20mm equivalent) and it's doing a good job[0] - focus peaking on the OM helps a lot with manual focus and aged eyes.

[0] Excepting that it's still wide enough to capture your fingers when adjusting focus or aperture[1] or holding the lens.

[1] Which is the wrong way around to "normal" - clockwise should close the aperture, not open it!