4. Just like Gears 2, they don't have SSAO on moving characters. When characters die and lay on the ground, they get SSAO, but if you look at Batman's feet, he doesn't get any.
Geras 2 does have SSAO for characters on the environment, but it's not very noticeable most of the time. Self-SSAO would be pretty hard to see given the colour palette though.