Thank you for your replies and your help.
Maybe Im not explain well I need to know and sorry for that. Basicly I'm gonna shoot a short film with my a7s camera in S-log and im gonna use a external recorder like a Shogun and I want a look like of the film like"Her" and "mr.Robot" look, like low contrast and low saturation with just some saturation in specific colors like red and yellow. So I put this question because I wanted convert the S-log signal on monitor/recording assist with a LUT. But I think the best way to do this using Rec 709 for exposing correctly the image and control this "low contrast and low saturation" to the film on postproduction, I'm right?
Sorry for my bad explanation guys :(