Michael Reichmann of the Luminous Landscape makes the following comment...
The Sony A7RII runs a neck and neck image quality race with the big Pentax, and so calling a winner is almost impossible. But I will say, that the A7RII is the first full-frame 35mm format camera that can challenge current medium format in terms of both image quality and resolution. Factors such as higher frame rates, focus tracking, on-sensor phase detection AF and sensor-based image stabilization with any lens simply lean the equation in the Sony’s favour. But, it’s a tough call, and I’m happy to own and use both, as the need and mood arises.
Frankly, if I had to choose one over the other I’d go with the A7RII. And, keep in mind that the Pentax costs $8,500 while the Sony is $3,200 (bodies only). Yet, I’m hanging on to my 645z because it’s a camera system that I love to shoot with.
Check out the link...
https://luminous-landscape.com/sony-a7r ... on-report/