"I thought I told you to bring the good car."
The Mercedes-Maybach S600 is the quietest sedan in the world, according to Mercedes. That might not mean too much on its own, but in the context of the ultra-luxury market, it suggests that, even though the S600 isn't the most expensive luxury sedan that you can by, Mercedes is committed to being competitive. So here you can see a good in depth review of the new luxo barge, and decide for yourself if it is indeed worth the hefty price bump from the standard S-Class.
It might not be a Rolls-Royce Phantom, but then you could buy two of these for the price of a Phantom.