Yes, the Sony F4 versions. I only have limited time with it so far, so not sure I am qualified to answer your queries, but as you asked I'll give an opinion for whatever its worth.
I do landscape, pretty the only thing I do, and so wide angle is my usual choice. The overlap between the 16-35 and 24-70 is less of an issue with the A7R due to the large number of pixels, whereas with say a 16mp camera you would be left with quite a small final version. So with the A7R its (for me) a viable option to crop the 35mm to give a 50, 60 or even 70mm. However, thats because its something I dont use much, if you take a lot images in that 35-70 range then it would probably be best to have a lens whose focal length is within that actual range.
I dont use the OSS much as mostly I use a tripod with the OSS switched off, so have no idea.
Again, for my focusing its fine, however I think while it may be usable for moving subjects it may well be a bit of a pain if its something you use it for a lot. To me, the A7R is more for someone who photographs static scenes, and while it may do the job for moving subjects I suspect an A7 would be a better choice.
There are a gadzillion reviews and opinions on the net about the A7X cameras. Each person has their own experiences and opinion. Mine is for landscape the A7R is superb, but for action or general photography the A7m especially the A7 Mk2 is the better choice.
Creo