Charles,
You have cost me a lot of money, just bought the A7s from Melbourne.
I brought along the A7r and the FE lenses. You were right, the camera feels the same to handle but behaves much better. Focus is fast and accurate, start up is faster and the oop jpgs are much better, significantly better.
The White Balance is much more what I see and does not require correction.
I have not had a decent play with it as yet, looking forward to it. Thanks for your input and advice