I am not sure if I am seeing all of this right, but new full resolution test shots (jpegs) of the 5DSr are up on imaging resources and from what I see, the 5DRs blows the doors off of the D810 at ISO 6400. Again I might not be comparing the right images, but I think I am smart enough to figure it out and it ain't pretty for the D810.
Here is the link:
http://www.imaging-resource.com/PRODS/canon-5ds-r/canon-5ds-rA7.HTM
I also made comparable screen grabs of the two.
Here is the link:
http://www.imaging-resource.com/PRODS/canon-5ds-r/canon-5ds-rA7.HTM
I also made comparable screen grabs of the two.