Thanks for the info!The miniprimes solution will get you the standard dof look of hollywood films, a 2.8-4 split (on s35).
It won't be the most shallow dof possible. Though this is not a problem. Dp's in fact often struggle to shoot f4, because they want more dof to make focusing easier on the puller.
To be sure, the miniprimes are as good as it gets with shallow dof on 2/3. (there is a c mount schneider optic which is 17mm f.95 for about 1300$) Otherwise to get shallower you will need s35. But consider a unique advantage on the 2/3 miniprime route is that you will have the same dof as a typical film - with two and a half stops more light! Thats 6 times the amount of light, leading to interesting focusing possibilities in darkly lit scenes. And supposedly there will be kit pricing on the 2/3 brain. I am personally interested in this brain for achieving the lightest weight 3d cam around (these things get heavy).
Next step: Red needs to actually come out with this thing!