Does A DSLR APS-C Camera Produce Creamier Bokeh Than A Mirrorless APS-C Camera?

For your "fair" comparison, you want different distances, different focal lengths, possibly different aspect ratios, etc....so make everything un-equal.

Why is is so hard to understand that lenses don't change properties when put on different cameras?  F/1.4 is always F/1.4.

For DoF, here is the reality...

- FF 50mm, F/2.8 at 10 feet, DoF=2.06 feet

- M43 50mm, F/2.8 at 10 feet, DoF=1.02 feet

You can change the parameters however you want to get your desired results too.  For example you could move the FF camera to 7 feet to get the same DoF.   You could crop the FF image to a 4:3 aspect ratio, and move the M43 camera a foot or back, etc.  Heck, you could even change distance, focal length, apertures and use un-equal ARs to try to make a point!