The full-sized luxury market used to be a small pond before the Lexus LS appeared. Up to then all Mercedes had to worry about was the German brand known for their delightfully crude 2002. Jaguar? 1980s Jags spent so little time running they were more garage ornament than transportation. Fast forward to today and BMW is the new Mercedes and the full-sized luxury segment is getting crowded with entries from Audi, Porsche and an XJ that spends enough time running to count. Where does that leave the S-Class’ old foe? BMW tossed us the keys to their most popular 7 to find out.