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At nearly 13 minutes long, it might be worth noting that this is not an actual head-to-head comparison video, but rather a brief review (marketing overview?) of the '14 S8/A8 mashed up with a similar Mercedes promo/marketing video for the new S Class.
They still have a lot of work to refine that. It obviously blinds the incoming driver for a good second before switching off the corresponding section of the headlights.
..And this was in very very slow driving conditions.