Probably could as long as you can find one with enough megapixels for your uses. But the only two cameras that could possibly considered a pro level 4/3rds camera are around $2,000, so it’s not really worth doing, mostly because of the lens options available. Big difference between the crop factors as well, so anyone shooting real wide will have issues finding lenses.

There are more lenses available for Fuji x mount, than all of the 4/3 lenses combined.