I doubt whether there is a single scientific quantifiable thing and also i'd disagree about Arri (obviously) and also say that 90% of this is experience.
Red tends to always follow the same workflow and it works really well and 90% of the time you get the results you're looking for. I feel that other systems make you jump through hoops at times. If i process DNGs from a sigma fp in a typical 709 DNG workflow they can look meh. If i work with these underneath an IPP2 workflow i can pretty much match Red.
But i'd also say that there is a tendency for people using Red to be better cinematographers, actually have lighting packages, know how to move and what to light and understand tonally what it is to be filmic. Conversely i've seen BMD work (John Brawley) which is also excellent and filmic. I suspect this has more to do with it than you think!
cheers
Paul