Funny, that most of you here in the forum comment the absence of RED on the Oscar nominees by technical picture details (pro and cons).
May I give a hint to a possible reason not yet mentioned here:
The RED Epic is a quite noisy camera (soundwise) and degrades the quality of actors dialogue to a huge degree. If I was a producer and I would pay millions of dollars to get the best actors in the world to play for my movie, I would not work with a camera, which makes half of their work (dialogue) go directly into the trash bin!
Even ten years after their first ONE camera, RED hasn´t managed to produce silent cameras, a big obstacle for scenic movies (if that´s the right expression?). The Epic fans only go down to 30% speed while recording - not 0% - a mess!
Yes - there have been movies shot with RED. But either the directors/producers didn´t care for actors ADR, or it was such a SFX-movie, that the dialogue couldn´t be captured at all, as most of the other SFX equipment is even more noisy than the camera.
But if you want to shoot an indoor scene with a big portion of dialogue and actors presence, then RED is not the choice for a good movie. Maybe that´s a reason.
Best regards,
Andreas