This is a demo of gaining 2.5 stops range in the highlights (allowing for a little more than +5 stops over exposure) with a Red camera and trying to make the colorimetry resemble 5219/7219.

Am i somewhat close?

Notice how I I am getting a T2 reading from my wifes face and getting a T11-16 split on the roof but it still holds the highlight.

Thats over a 5 stop difference. The compromise of this method of rating a camera is you get noisier shadows- fine by me most of the time!

You can go to my blog: LightPlusMotion.com to see the more about this method and see a comparison.