Hi,
I would wait a couple of months, if possible. Photokina is around the corner so I expect that a lot of new products will be released. I would think that the Sony A7r was rushed to market and it is probably due for an update. Or some other new equipment from Nikon, Canon or whoever.
Nikon D810 has electronic first curtain, which would help the A7r a lot. Keep in mind that an EFC also makes the camera much more responsive.
Most folks are happy with their A7r, although the shutter related vibration is a demonstrable problem, still many don't observe it. May be it is more measurable than noticeable. Well, on the link Bernard posted it was obviously very noticeable.
Personally, I decided against the A7/A7r. Why?
- I don't feel the system is mature
- The A7r has neither EFC, on sensor phase detecting AF or OLP filter. I definitively want all of that. The A7 has all of that.
So, I wait till Photokina and decide on long term planning when I have seen what is around the corner.
By the way, I am a long time Sony shooter, Minolta before that.
Best regards
Erik
OK, enjoy the new camera.
I hope you won't run into the trouble that this gentlemen is current reporting about here at LL: http://www.luminous-landscape.com/forum/index.php?topic=91415.0
If I were you I would also consider the a7 instead of the a7r. You may end up with less grey hair and better actual image quality in some cases and will keep more cash for lenses (at least here in Tokyo the a7 can be had new for 1,200 US$).
Cheers,
Bernard