The big progress in lighting within Mercedes arrived in 1992 in the C Class with the Complex Surface reflector from Valeo and the Calculated Surface from Bosch.
From this this time, Mercedes took the lead with some other car makers and have today one of the best light systems with Audi. Examples are the new E-Class, S-Class-Facelift and the new CLS which achieve the best performance in light systems I have seen.