Pardon me if I get it wrong. RED is kind of complicated to understand since they have a lot of different hardware and different sensors. They even have MF sensors ... and communication is not that fluid around this. There is different scarlet cameras (4 different models and 3 different sensors...) and different epic cameras (4 different models with 4 different sensors). I'm sure there is more as the date of today... Hard to understand the whole picture.
Just to clarify a bit, have been only three sensors over the entire life of RED cameras: the original
Mysterium from about 2008. That was replaced by the
Mysterium-X (commonly called
MX) in 2011 or so, and the current,
Dragon sensor was introduced in late 2013. Dragon and MX are both currently sold by RED. Oh yes, there are also Monochrome versions of both current sensors sold only in Epic bodies, so i guess that does qualify as four different sensors.
I'm only aware of two models of Scarlet--MX and Dragon. Epic has more, but the body differences are mostly about weight--Carbon fiber for gimbal use and the like. And there is a new Weapon camera model that uses the Dragon sensor. Some time around the end of the year it will be available with an 8K version of the Dragon sensor that is larger than 35mm full frame in one dimension, but I don't think it comes near to qualifying as medium format.
I'm sure Red's lineup is confusing if you're not paying attention to it, but I don't see why anybody who's not actively in the market for a digital cinema camera
would be paying attention to it. Honestly, though, I don't really see how it's any more confusing than Phase One/Leaf's line of backs, for example. Right now digital back.com lists 7 Leaf backs and 10 Phase backs, plus cameras and accessories and referbs -- all stuff you'd expect, really.
But I'll grant you that if you try to figure any of that out via Reduser.com, communicaton is not that clear.