I have always thought comparing everything to a full frame camera is a bit silly (it is also Ironic that I called it a full frame camera...as if a M4/3 camera is only part of a frame
). Just think about it. I could compare your full frame camera to a medium format camera, or large format camera, and show that a full frame camera does not provide enough control over depth of field. This difference may be important to some, but not to others. For me the comparison between full frame and M4/3 is irrelevant (full frame is out of the size range I desire and out of my price range). I am more interested in the comparison between M4/3 and APS-C (which I hear is fairly negligible... particularly if you are in the habit of cropping to a 4/3 aspect ratio).
I understand that a full frame makes a good benchmark for comparison, but a full frame camera is not necessarily the end-all of camera formats.