I saw the A7 at Photo plus today and it's really about the same size as the OMD EM1. Costs only a few hundred more. I am very close to giving into the full frame lust as I love the IQ from my M9.
The only thing holding me back are the fantastic lenses for M4/3. But push come to shove I only need a 50mm normal and a wider lens. and the two sony primes, although slow, could meet my needs.
Anyone considering a similar move? why or why not.