I own a RED Dragon and use it on every shoot. The color from it is fantastic as is the form factor and modularity. That being said, I prefer the look of the Arri color. 90% of the time when watching a film I can tell whether or not it's shot on an Arri due to the special sauce they have in their sensor. I feel that more people will choose Arri because of it's color and because the bodies have more functionality built in without having to add a bunch of modules.