Here's the thing. If you don't get the A7r you'll never know what you missed. As a chap who had the A7 and changed it for the A7r I have some experience.
The difference in resolution is amazing and using the 55/1.8 FE, as an example, the images are so sharp. Even with Leica lenses, which are being dissed by almost everyone, I find the quality as good as the M240.
Of course, there will be the nay sayers; there always is. Those are usually the people who didn't get the A7r (but secretly covet it).
Actually I do no what I am missing. Since having owned a D800/E and all Zeiss MF glass, yeah it was nice but always required top notch technique.
If I want to go that route I still use my Medium Format setup that IMHO smokes the D800/E.
The A7R is for sure an awesome camera. No question. Maybe I will look at it again in the future and when the price comes down which I am sure it will.
I still like to shoot long glass to for landscapes 200mm and since there is no native FE long glass yet, which I doubt there will ever be, because of just the near size of even a 200/4 FF lens, and looking at these images of different peoples Nikon F or Leica R Glass adaptor sitting on a RRS rail, etc, to much hassle for me.
Lets not forget before the A7 series came out everyone was writing Sony off completely now everybody wants one and its also funny that not to long ago most people hated EVF, now everyone wants one for manual focusing. When I sold my D800/e earlier this year and switched to the Sony A99 everyone probably though I was crazy, but you know what for me it was a great move, I love to manual focus, and the Nikon OVF 36mp was not happening on top of the LV implementation was also bad. So for me, yeah I currently own 2 24mp cameras, one small and one well kind of bigger but has a mature lens eco system where the other is just a starting off.
There is no right or wrong here. Just different strokes for different folks. Now I just wish I was back in Telluride where there is endless shooting opportunities as here in Park City, not so much.