I just exchanged my NEX-7 + Zeiss 24/1.8 for a X-Pro 1 and 35/1.4, I didn't even turn it on before flashing the new firmware, and I was using a Mac 27".
Needless to say, the performance of the camera is astounding to me, the focus seems great actually.
Not entirely sure how it could go wrong if you're just copying DAT files over to the card.