zumbido, what you're saying is contrary to every trend in computer industry and camera sensor market.
When CanoNikon had a firm grip on the market, they stalled as much as they could the sensor wars because there was no sense in getting into that cut throat struggle, but then Sony came along with its FF DSLR and as one of the leading sensor makers it begun to make those two really nervous. But not only that, other companies begun to chip in the entry level DSLR and high-end P&S market with 4/3 and other large sensor cameras.
So, in this free-for-all market, which is the best way to get ahead? Very simple, larger sensors. And who's leading the charge, Sony, because Sony has everything to gain and nothing to lose. its DSLRs are a minuscule market, so its going after the entry level DLSR market and throwing the full weight of its sensor technology behind it with large sensor compacts that have interchangeable lenses mount.
I mean, you give one good reason why I should by a GF1 or MP2 when NEX 5 with a larger sensor and comparable performance is available for $400 cheaper?