Clearly Bokeh is subjective but for me the Leica/Panasonic wins. We were just in the Northern Sea of Cortez and I shot a lot of brown cheeked blennies with both lenses in similar backgrounds, will try to post some later today.
I have and shoot both. In my opinion the Bokeh on the Panasonic is much better than on the Olympus but the 60 is slightly sharper and focuses slightly faster for me (EM-1, Subal Housing). Neither are hard to handle in my opinion but neither are as simple as a 60 on FF. In terms of macro both lenses shoot 1:1 so the magnification (i.e. the macroness) is identical for either lens although adding a diopter to the 60 will get more mag than the same diopter on the 45.