saw the form 2 in action last week - fast it isn't.

Each layer goes through 4 seperate processes to print.
The part is dunked into a thin layer of resin. Then the laser flashes round all the bits to be printed - a lot slower than I was expecting it to. Then the part is lifted out of the resin, the resin is scraped across the vat and a new layer sloshes back across then we're back to the part being dunked back into the vat for the next layer.

The carbon 3d and the other one that works in a similiar manner, just seem to pull the part from the vat with none of the lifting, dunking and wiping.
So I would expect them to be a lot more expensive - not necessarily because it'll cost more to make the machines - but because people will pay more for the speed.

Now to the realities of fff versus resin machines.

At the moment the resin for the same weight is 2-3 times more expensive than filament.
It also lacks the massive range of filament types that fff has. This will no doubt change in the neft couple of years.
Resin machines also tend to have much smaller build volumes.

So unless you really need ultra high resolution prints - for the most part you will be better off with an fff machine.