Why use the Epic? Because it has a certain look, there is more that separates the look of the epic from the f900 than just RAW...
You do understand that you can set a look in camera or even better in RCX and import it in to the camera?
I use the Atomos Samurai for quick turnaround for Broadcast deliverables. Yes, the SDI out is 422. I load a punchier look in to the Epic/Scarlet (gets the shot close to what the client wants, their editor will do any final tweeks) and start shooting. You lose is the ability to make corrections to individual clips....But even then, if i need to, I will dial back (or increase) contrast, shadow, saturation etc IN CAMERA if a particular shot needs it.
I think the RED cameras have a place in the Broadcast world and a pro res module would go a long way in helping that...unfortunately I think it's so long overdue that the perception of the Epic/Scarlet is now really becoming that it is too much of hassle on the post end to use it for quick turnaround jobs.