Decisions Decisions… m4/3 vs NEX

So just to get a rough idea of size and weight here are the empty body weights and lens weight for lens(systems)giving 28-250mm (35mm equiv) focal lengths.
The Sony Bodies are thinner than the Olympus ones I think, but their lenses longer.

pana 14-140mm OIS, 460g
pana 14-42mm OIS,95g
+
GF2C 262g
Minimum weight: 722g

Olymp 12-50mm 211g, 83mm long, dust and spray resistant
Olymp 14-42mm II R, 113g, 50mm long
Olymp 14-150mm, 280g, 83mm long
Olymp 40-150mm, 190g, 83mm long
+
OM-D OIS 365g
Minimum weight: 645g

Sony 18-200mm OIS, 524g, 102 mm long!
Tamron 18-200 OIS, 460g
Sony 18-55mm OIS, 194g, 60mm long
Sony 55-210mm OIS, 345g, 108mm long!
Sony 16mm,70g, 23mm long
+
NEX7 291g
Minimum weight: 751g

For comparison lightweight APSC SLR:
Sony 18-250mm 440g , this is a larger zoom range(15x vs 10x), a 18-200 is 40g less
Sony a500 DSLR 596g
Total 1036g
This is about 300-400g more.
It would seem that the biggest gains for the mirrorless systems are NEX with a pancake lens, where the flat package might fit in a pocket, and m4/3 for longer telephoto lenses where the smaller glass can be a fair bit lighter.

To you guys looking at the OM-D, dpreview.com has their initial studio ISO test shots up, and they are very impressive, best of any m4/3 camera to date. Noise performance is arguably equal to, if not slightly better than, the NEX-5N. Given the m4/3 has a much better stable of native lenses, the OM-D's sensor performance makes it look like a clear winner in the "light high performance camera" derby.

Or, in other words, the camera market just got a lot more interesting, as Olympus got off their butts, and closed the performance gap from m4/3 to APS-C.