Card to Card Copy Speed - D800(E)
I was now able to test this out myself, so just in case anyone's interested.
D800E copy from Lexar 1000x 32GB CF card to Lexar 400x SDXC 128GB card.
50 images copied, range of file size from 37MB to 50MB, average 38MB, total size of the 50 files 1.85GB, these are 14-bit D800E, FX, NEF, Lossless-Compressed images.
Duration 113 seconds, i.e. ~17MB/s
Gallery at http://www.rolandwooster.com