Using M Lenses on a Panasonic Camera: Sacrifice, Sacrilege, or Sweet Spot?

I recently did a deep dive in my quest to determine the pros, cons, and in-betweens of using M-mount lenses on my Panasonic Lumix S5 IIx body. I also compared the lenses on other cameras. Some results were as expected, others were not and there were a few surprises.