As the brand’s top-selling model worldwide, the compact C-Class is often the first Mercedes a person buys. And as they mature through a life well lived, a flagship S-Class awaits them in their twilight. But for 2015, Mercedes is giving their younger shoppers instant gratification in this all-new C400 – a car commonly referred to as the baby S-Class. This complete overhaul of the C-Class includes new model designations, a …