The actual amount of killing and violence is condensed mainly into the last 20 minutes although the worst stuff isn't usually fully onscreen.
A man is shown wearing another man's cut off face. Quite a bit of blood is shown. Is done off-screen.
A man bites a prison guard on the face (bloody), and then beats another prison guard to death. Very bloody and the bloody dead body is later shown for a long time.
A man is shot to death and blood sprays out of his body. He is later shown lying on the floor, dying with blood spraying from his mouth.
A dead body is shown on top of an elevator with lots of blood. He is shot in the leg (blood sprays), and then falls through the elevator. He is shown from the back, but torn skin on his head is shown, implying his face has been cut off.
Very graphic but infrequent violence. More shocking and disturbing than overly gory.
The dead body of a prison guard is shown hung from a prison cell in a mimicry of the crucifixion scene. The guard's stomach is cut with guts hanging out, and the top of his head is ripped open as well. The camera pushes in on the body. Very bloody and graphic.
We see very graphic crime photos of the dead bodies of women in a lot of scenes. An autopsy scene shows the dead, nude, and decomposing body of a woman.
An old woman's body is seen briefly in a bathtub full of purple colored acid.
Few brief references to cannibalistic acts.