As usual Michael's review was, for me, incredibly useful. As befits a landmark camera it was thorough, and especially so in the areas that matter to me: handling & ergonomics, and output to print.
I have been using a M4/3 setup for 2 years now, along with my usual Canon pro gear. I have come to really enjoy having a responsive camera and 2 or 3 primes with me all the time, and with pretty decent output. In fact, in some circumstances the output has been excellent.
Unlike some, I don't find the Nex setup overly large with the native lenses. Certainly larger than the M4/3, and indeed I would like the lenses to be smaller. But when I step into the realm of actual handling, a Nex with the 24 or 50 is, overall, much lighter and less bulky than my 'pro' gear: it will easily be comfortable in the same bag I use for my M4/3 gear.
The Nex 7 is looking good as a candidate to replace both sets of current equipment. I hope they add a native 35 (50 equivalent), but that can be resolved using a MF lens.
Anyway, thanks Michael for concentrating on the stuff I needed to know.