Camera Labs has posted RAW image comparison of new Sony a7RII (Amazon, B&H Photo Video, Adorama) and Canon EOS 5Ds R (Amazon, B&H, Adorama). Using a third part lens on both camera: Sigma 50mm f/1.4 DG HSM Art lens. ISO at 100.
According to an interview with Kimio Maki, Sony Corp by imaging-resource, Sony currently is working on uncompressed RAW for mirrorless cameras, this feature will coming to a7RII one day by a firmware update. And Kimio Maki also told us some great features of the new announced Sony alpha a7RII (Amazon | B&H | Adorama).