You can see pictures taken with that lens here. Using an Olympus OM-D E-M10. That’s with a dumb adapter.
YI 42.5mm F1.8 Lens on Olympus OM-D E-M10
I’ll have some pictures taken with that lens on my camera soon. It was cheap on eBay, and I saw some pictures taken with it, then realizing I had to have it, at least for a little over $100. It was used once, it says. Glad they didn’t like it.
That’s the same reason I bought a manual lens I have, but getting that in focus is a pain.
The YI has auto focus. It has no manual focus on an Olympus or Panasonic body. I probably can’t even update the firmware on the lens. Or does the firmware live on the camera? There’s separate firmware for their camera and that lens on their site.