@Ross - I'm with you on film. I still own a Contax T3 and I'd be awfully hesitant to say that it cannot capture better images with Velvia 50 than any digital on the market that is twice its weight or lighter…just didn't feel the need to open that Pandora's box up on this review ;)
@Tom - The GH2 just might be my pick if my primary focus was videography instead of still photography. My primary focus remains in shooting stills, for now. It's a super camera (the GH2) for video, and the tele zoom feature pioneered on it was brilliant. It's bulkier than the NEX7. Photo quality is a toss up for routine, low-contrast photos. At the "fringes" of contrast or for low light (long exposures at low ISO), the NEX-7 captures a noticeably cleaner image with better dynamic range - not a "lot" by web viewing standards, but meaningful nonetheless - to me at least.
@Tony - the case I'm using is the Lowepro Edit 100. A fine case. It doesn't have a rain cover though, so I use a shower cap (one for the case, one for the camera when shooting in the rain. I'm looking for a lighter case, yes (I may just make one), the Edit 100 is just what I have now, and it fits the NEX7 with a lens very well.
@Jacob - I don't plan on doing a side-by-side comparison with RF lenses on the 5N vs. the 7, so can't comment on that.
@Bradley - regarding the image circle on MFT sensors = smaller, lighter lenses - you are correct. This remains true as you continue to go down in sensor size. (Check out the lenses on the new small sensor interchangeable lens Nikons, the V1/J1. The lenses are tiny.) For example, the Olympus and Panny 14-42 zooms are 3.4 (the "X" << very cool lens) to 6.9 oz. The Sony 18-55 is 6.9 oz. I've used my Leica lenses on both Oly and Panny MFT bodies, all the way back to the EP1 and GF1. You are right in that it becomes easy enough in practice. Manual focusing on the NEX7 takes it to another level of joy, though. Finally, my "higher image quality for less weight" should really be taken in context with DSLR systems rather than other mirror less systems. The GX1 is also a super little camera, but gives up some nice features like dial controls (it does still have one dial) and a VF. I love how the GX1 feels in the hand with that new 14-42 lens, though.
@Duane - I love Ricoh cameras. I shot with a GRD for years, and may pull the trigger on its next iteration. The GXR has the a great UI, but no built in VF, and no vid, which for me is a deal killer. Yes, the NEX7 suffers from color fringing with retrofocus lenses like the Elmarit-M 28/2.8, but it's easily corrected. I use Cornerfix.
@Frank - buy used Leica lenses and shop around. You can get some great deals on them (not on eBay - seek out used dealers). The Voigtlander 15/4.5 is a KILLER lens, by the way, and a steal for that price.