A tu z kolei wywiad n/t α99, NEXa i RX1: Q&A with Sony’s Mark Weir: Will full-frame go mirrorless, and what’s the deal with Dual AF? - Imaging Resource

DE: Is the RX1’s sensor the same as the one in the A99? And if so, why is there no phase detect AF on the RX1?

MW: Well, the sensor is basically the same design, the same structure, the same generation of development, the same advantages in terms of sensitivity and dynamic range, it offers the 14-bit output. However, in the RX1, a variant of the sensor without phase-detection pixels was selected because the plan for the camera was for it to be contrast-AF from the beginning.