Brant - super review, thanks for all those details! The R-bodies are clear winners in so many ways. I'd certainly lean to getting one when the 1DXIII becomes the 1DX-R. When I imagine all the mirrorless benefits merged with the 1DX, it boggles the mind. But really, I'm still super happy with what I have, and it's sort of like owning a Ferrari and wondering if I should get a Lamborghini (just a tiny bit less costly )