Here I have had some time to experiment with a typical portrait / interview scenario with the simplest of tools and using what you have and what mist might have access to in the real world of filmmaking. The problem
All grabs taken with RED Scarlet-X "Scratch" and the Helios 44-2 58mm f/2 (m42 adapted to EF)
All grabs taken with RED Scarlet-X "Scratch" with the Voigtländer 40mm Ultron f/2