I don't use MFT, but many good lenses can be used reversed with good results on DSLRs. The primary issue with modern lenses is that the aperture is usually controlled electronically, when reversed you lose control of the aperture. Instead, I have used old manual focus lenses reversed. Minolta MD and Canon FD are good choices for this since they aren't used much anymore and can be obtained cheaply or free. I have used 50mm and 28 mm reversed on my DSLR. On an MFT system, the lens is much closer to the sensor, you may need to add an extension tube to compensate. Or, maybe not, experiment.
There are some examples in my presentation here, pages 17-19:
Are manual focus lenses Telecentric? Probably not, but you can get decent results anyway.