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.
Yes, it's true that color does not exist in the physical universe: it exists only in the brain. But this doesn't mean that one person can see blue internally as yellow and that another could see it as red. The reactions and recognition of colors is neurological in nature. Once it occurs there isn't yet another evaluation that takes place. Blue looks to me as blue in precisely the same way it does to you, by definition.