Those sleepers don't really work here in Germany, because we do not have those traffic light drag races. Our traffic lights are usually switched in a "green wave" road, which means once you have a greenlight, it stays green all the way down the road, as long as you maintain the right speed.
And on the Autobahn rear view mirror image is everything. When you aren't recognized as "Yup, he's faster than me", no one will move over to let you pass, no matter how quick you are at overtaking them.
That's the reason, why everyone is making room for you, when you are in a big Mercedes: It is clearly recognizable as such. Mercedeses still have different faces, which can be identified in the rear view mirror.
However, no one will move over to let you pass, when you are in an Audi, because in the mirror you have no feeling for the size of a car's front and therefore no one is able to tell, if it's an A3, A4, A5, A6, A7 or A8 -- or even an RS6. They all look the same and have the same proportions in their "faces". BMW is bound to make the same mistake, btw. I cannot tell a 3-Series from a new 5er or 7er at first glance, when it comes from behind.
An S-Class, however, cannot be mixed up with an A-Class, a B-Class or even an E-Class. That's why they all make room for you, when you close up in an S-Class from behind. One of the reasons, why I prefer that car on the Autobahn over the competitors
Such sleepers therefore have no fun on the "Bahn" here, since they'll have a hard time convincing even a Smart driver to make room for them. They are only good for show events.