DxOMark posted their test results for the Sony a7r full frame mirrorless camera. Here is their conclusion:
"Although we can’t provide any commentary on image sharpness at this stage in our tests, the sensor in the Sony Alpha 7R performs exceptionally and is on a par with that found in the D800 models. Given the Sony’s small size, low weight and outstanding sensor performance, it’s one of the most intriguing and compelling new additions in recent times."