Image quality results from the EOS 5Ds R have been added to the Canon EF 24-70mm f/2.8L II USM Lens Review.
This is the lens that Canon shows mounted in the 5Ds and 5Ds R product images. There is a good reason for that choice.
B&H has the Canon EF 24-70mm f/2.8L II USM Lens in stock with a $100.00 MIR available through July 4th.