The one thing I don't quite understand is his remark about not wanting to scale up an image for concern it would generate pixels. Fair enough if he doesn't want to do that, but... In the first test using a 50mm lens on both cameras, it seems to me that he must have scaled up the tight M9 crops from 7.8MP to 18MP equivalent or they would not have matched the crop from the 18MP downsized Nex 7 shot.
I think a lot of todo was made of something that was probably nothing ... the images that were displayed in the first series from the M9 were probably just small crops from 100%. While he "cropped" them to match field of view, I didn't see anywhere in the article that indicates he resampled them to anything, so the article images where just cropped further. So the "cropping" really didn't have any affect on the image quality.
Probably the important point which he addressed very well in this article was using a different focal length lens to match FoV from the two cameras. There's certainly some logic to this and that's what most do when trying to compare resolution of two different sensor sizes.
To me the resolution quality differences are a "quibble" (a word I learned from Michael) so the real discussion is about FF vs APC (and the associated DoF issues), price point, and of course usability.
We've had NEX 7's on order from day one. I won't be able to keep them in stock for a while, the waiting list is growing. I'm planning on selling my M9 and lenses, but will wait to try some of them on the NEX 7 first. May keep a couple that I really like, now that I can focus things quickly.