I don't for the life of me understand why Canon designed and released a camera the caliber of the 5D3 without a UHS-1 high speed SD slot. Totally unacceptable for a camera that will otherwise still be relevant in all other ways for the next 3-5 years.
So you have to wonder, who benefits from this? CF media? A small inconvenience to help Canon sell another camera upgrade in the future? It just doesn't make much sense. Does Canon really secretly hate SD and thinks that UHS-1 performs so poorly that they don't want people using it when CF already works so well? Oh, but wait! The 6D will have a UHS-1 slot. Hmm. Will this help give the 6D a little more acceptance for those who can't afford the 5D3?
Oh forget it. I'm getting a headache. Where's that liquour cabinet key again?
I would of preferred 2 CF cards in the 5DIII, but I guess that's why there's the 1DX.