Did anyone here move from M43 to EOS-M?

I didn't move from one to the, but ran them side by side for a while.

In terms of image sensor quality, there is very little difference between the m4/3 20MP sensors and the Canon 24MP sensor.  The m4/3 sensors use a more modern architecture which negates much of the size advantage of the slightly larger Canon sensor.  If you are not photographing moving subjects, IBIS and m4/3 will give you a clear advantage. Basically, sensor size is not the reason to choose one over the other.  The newer, higher resolution M6 II would be the exception that would skew the equation more towards Canon, but it still not a complete blowout.

Where there is a significant difference is in the lens lineups.  Here, it will really depends on what lenses you need.  For a small, inexpensive  wide angle zoom, the Canon EF-M 11-22mm will be better than the m4/3 options.  For a small macro lens, the Olympus 60mm f/2.8 can't be beat.  The Panasonic 12-60mm f/3.5-5.6 is optically much better than either the Canon 15-45mm or 18-55mm, but it is also a bit bigger.  The Canon 32mm f/1.4 is a great lens that probably can't be matched in m4/3 with a similar size or price, but the same could be said about the Olympus 75mm f/1.8 and any Canon equivalent.  The one area where m4/3 has a massive advantage is if you need more than 300mm equivalent in focal length.  The Olympus Pro/Pana Leica lenses are definitely better than what you can get with Canon, but most of these lenses will be much bigger and much more expensive.

I would suggest taking budget out of the equation and then layout your dream kit with both systems.  Depending on your own personal focal length needs, one system will likely have a clear advantage over the other.