A further confusion. Sony seems to have no mention of "Local Dimming" here. Instead they are referring to "Frame Dimming" (which is something that I believe most folks could not STAND about Samsung TVs----so I'm hoping this isn't the same thing), and "Dynamic Edge LED Backlight". The latter sounds like a variant of local dimming.
Note also, that both of these things are lacking in the R550A models.
Violence is the last refuge of the incompetent. Unless, of course, it's to keep someone from creating a phone video in portrait mode, in which case it's a pretty good first step. Portrait mooks: KNOCK IT OFF.