Blu-Ray. If you are reading this, you no doubt already know whats going on here and I will leave the minutia to other reviewers and give no spoilers here. My short version is this. Performances: Oscar caliber. BD Disc: looks pretty decent. Movie itself: captivating yet disturbing. After watching this I felt exhausted and a little bit beat up, if you can understand what I mean. If you like movies for the art form as I do, definitely check this one out.