Sounds maybe stupid, but to be a fair comparison you should only compare adapters owned by people who pulled 100% out of they're instruments. What I shoot today with my M2 is very very different from what I was shooting yesterday, not only cause I'm now a bokeh-thinker even before switching camera, but also because I spent a lot of time fine adjusting things months ago.
Ooops...Now I see it has been long time ago...never happened?