The A7r, is a great camera. I recently got to shoot one during a review of a Arca M2 (sold as the DSLR2). I loved it. I like EVF's, as my 55 year eyes just don't work well in optical viewfinders anymore. I love focus peaking, tilting screens and the feedback that Sony gives on the LCD of the A7r is excellent. It's not a great screen in bright light, but none really are.
The A7r can be made to work, with either a Canon TS-E or Nikon PC-E lens with the Metabones adatper. The A7r is tiny, compared to any of the 35mm Full frame bodies you have mentioned. If I had not moved to Nikon in 2012 and still had my Canon lenses, I would have quickly moved to the A7r and A7.
45mm TS-E on a full frame 36MP camera is going to be so so. I owned 3 of them, the last one was a full replacement from Canon as my 2nd one kept slipping on adjustment. The focus on the old style TS-E's is really touchy as Canon had to allow for the movement. They definitely figured it out with the newer TS-E 24 II and 17II just excellent all the way around (miss them). The 90mm is great, and can be used for Macro very easily as Nancy P mentioned. Both the 45mm and 90mm TS-E are older designs, and have been around a while.
The show stealer, IMO is the old Contax/Zeiss 35mm shift. If you can find one of those get it. The mount conversion is easy with any of the adapters out there on the market. You don't get tilt with this lens, just shift, but it's one sharp lens.
One option is a Zork adapter and a Pentax 35mm or Mamiya 35mm non AF lens. You can also use the 35mm FA Pentax, as it has a manual aperture ring, and MA focus clutch. This will give you 18mm of shift, still no tilt.
Paul
Nikon's PC-E 45mm is a very good lens, I just wish the Nikon 24mm was as good. You will get very good results from it.
