I had adaptive xenons with cornering on my RRS, the cornering is good - when your speed drops below 30mph (IIRC) and you set the indicator to flash then a small floodlight on that side comes on illuminating the side of the road. If you are in a multistorey carpark then when you turn the steering wheel more than 1/4turn then the same happens if the headlights are turned on. It cannot be retro fitted to the car and replacement headlamp units for the RRS cost >£550 EACH (I know I had to buy two!) The headlamps don't actually move the cornering lamp is a second more powerful lamp in the side light reflector. Apart from passengers wondering what this light was that came on when we turned corners in the dark they also used to comment on the little "dance" that the adaptives do when you switch the lights on each time. The beams sort of start pointing downward and then move vertically up and then around until they have self levelled. Occassionally when you are stopped in traffic they go through the same "dance" as a self check. I often got asked if there was something wrong with my headlights by people who had not seen it before. I have a photo of the cornering lights which I will post if I can find it
BTW the LED foglights - having now learned that the "bar" of LEDs is not the "signature" lights I wonder now how many 2009MY+ Mercedes owners are really driving around with their foglights on...................... and some Porsche, Skoda and Audi owners
Edit:
Here is a photo of the section of the headlight unit showing the side light (in this case it is the lower lamp which I replaced with a 5 LED unit) and the angled "projector" lamp of the cornering light