We shoot using a 1Ds3 and 1Dx, as others have mentioned, I would really like to see base line iso improve. The 1Ds3 continues to be the "go to" camera of choice for product studio work for us.
The 1Ds3 might not have speed or high iso, but at iso 100 it is still stunning.
I think we are going to wait and see what the 5D next generation brings. The leap forward in the 5D3 brought it too close to the 1Dx IMHO.