Of the Audi S8’s competition, the Maserati Quattroporte is the most compelling alternative. Face it: certain wealthy enclaves are already awash in BMW 760iLs, Jaguar XJRs, and Mercedes-Benz S600s. Cadillac’s STS-V isn’t even on the radar scope except perhaps for Chicago’s Gold Coast. But even in Newport Beach, Mercer Island, Westchester County, and West Palm Beach, a Maserati Quattroporte is a rare sight. More compelling is the $112,200 price tag for the new Sport GT version, which slots the Maser in right above our as-tested S8. Just be sure to pony up for the extended warranty coverage.