The other problem with the NEX 7. I had a class 10 SD card in it. And although it shoots 10 fps, but in P mode, shooting in JPEG only, I take one shot, and the camera spends the next 5 seconds busy, writing to the card. I cannot take another shot or do anything else. That is a total deal breaker.
With the E-M5, I can keep shooting even if the card is still writing. Sometimes, I fire off a whole series of 9 fps shots, and I realize that after 10-15 seconds, the card is still writing. But I do not lose any functionality in the camera while all this is occuring. Mind you, I was testing it while shooting RAW + JPEG.