I viewed this 2018 video, to get a perspective of how much smaller the Olympus cameras are than other cameras... The video actually compares the micro 4:3 to a full frame camera when it comes to image quality. I have neither, as I've only owned APS-C DSLR's.
While I am impressed by the size of the micro 4:3, I actually came away with a conclusion that, just perhaps, all the talk about image quality advantage of a FF camera, perhaps, just perhaps, may be a bit of "hype."
The video:
To jump straight to the image comparison, you can click to about 8:50 in the video.
Regards,
Michael