For me, the size comparisons are absolutely critical. When I'm traveling by car, and only moving around on foot for short distances, I prefer a FF or APS-C DSLR (specifically, now, the Pentax K5) because I like the viewfinders better than EVFs. However, when I'm traveling by air, or walking longer distances, or doing certain kinds of street photography, I take the m4/3 system, the Panasonic. I wish the comparison had shown the GF1 rather than the GH2, because that's the more size-critical version of the Panasonic cameras. But, I understand that you can't have everything in practical reviews.
Some questions, if Michael is inclined to answer them:
-Is the "bag" of gear you carry, with native-mount lenses, much different in terms of weight and size between the Panasonic and the NEX cameras? Could you stow both bags in the overhead in regional jets?
-Is there a sharp difference between the Panasonics and the NEXs in print quality for, say, 19-inch prints?
-Leica lenses aside, how do you judge the lens quality of the two systems?
-Do the Leica lenses provide an increase in performance that is apparent in prints?