tonyxcom wrote in post #17999414
But then there isn't much benefit to one of them being CFast if the CF card can't keep up with the buffer. Truth be told, I've never even hit the buffer on my 1DX so it likely wont be a problem with the 1DX2. The system just feels crippled carrying the legacy format over.
Having just spent $6000 on a camera, I don't see many people scoffing at having to buy CFast cards. I think the fact that most places seem to be sold out of CFast cards right now at least partially confirms that assertion.
I guess the logic escapes me at the moment as to how the Mark II is viewed as crippled by CF when you admit to never hitting the buffer on the 1DX. If Canon had stuck with dual CF cards, would this even be discussed?
I would venture to guess that MOST of the Mark II sales will go to professional sports/action shooters or journalists who don't bother shooting RAW. They shoot primarily JPG and the faster they can get the image uploaded, the faster they complete their job and get paid. And with JPG, you can shoot at 14fps all day long, even with CF. That is until your card fills up or you run out of battery. CFast makes no difference to those who the camera is primarily targeting.
The CFast was really only introduced so that 4k/60fps video can be achieved. It just happens that it greatly benefits the the Mark II stills shooter in clearing the buffer, which really is only enough for 43-59 RAW files if you believe the camera LCD readout. (1DX buffer reads 26-35 RAW files.)
I think that's why Canon offered the Premium Kit from the get-go. They realize many pros want to write to 2 cards. So instead of forcing them to buy 2 CFast cards, they provide a free (included) 64gb card to go with whatever CF card is already in your possession. That's ~1700+ RAWs in 64gb space. ~6400+ JPGs. I'd hate to be the pro sports shooter sorting through 6400 jpgs trying to send out to the publisher. 
I think realistically, the only people that may have a legitimate gripe of not having dual CFast are those who want to record 4k/60fps and want to write to both cards at the same time. (I admit I have not even read the new manual yet. Is dual-video writing even a feature/function?)