Sorry but in terms of DoF/bokeh there's no wobbly ground.
In fact even the speed argument is nonsense. A X mp full format sensor has the same noise characteristic at 2x the ISO of a X mp APS-C sensor - give or take a little due to different sensor technologies. Thus when taking the same noise/DR characteristic a full format camera with 70-200mm f/4 (the system comprising both components) is also "as fast" as a APS-C camera with a 50-140mm f/2.8 lens.
I am a fan of MFT/APS-C format mirrorless system but there are realities that I accept. The crop factor has to be applied to field-of-view, depth-of-field and speed. Beyond we are entering esoteric realms.
Regarding centering - it's too early to call off the worries IMHO.
In fact even the speed argument is nonsense. A X mp full format sensor has the same noise characteristic at 2x the ISO of a X mp APS-C sensor - give or take a little due to different sensor technologies. Thus when taking the same noise/DR characteristic a full format camera with 70-200mm f/4 (the system comprising both components) is also "as fast" as a APS-C camera with a 50-140mm f/2.8 lens.
I am a fan of MFT/APS-C format mirrorless system but there are realities that I accept. The crop factor has to be applied to field-of-view, depth-of-field and speed. Beyond we are entering esoteric realms.
Regarding centering - it's too early to call off the worries IMHO.