Car and Driver used to do lots of comparison tests of cars (now it’s mostly SUVs), so here are some from the 2000-2010 era. Sometimes MB came out ahead, sometimes BMW, sometimes they were both behind Infiniti, Audi, or Lexus:
Tested: 2007 Luxury Performance Sedan Comparison (caranddriver.com)
Tested: 2021 Audi RS7 vs. BMW M8 GC vs. Mercedes-AMG GT63 S (caranddriver.com)
Tested: 2004 Big-Money Luxury Sedan Comparison (caranddriver.com)
Tested: 2004 Luxury Sports Coupe Comparison (caranddriver.com)
Tested: 2007 Long-Wheelbase Luxury Sedan Comparison (caranddriver.com)
Tested: 2008 BMW M3 vs. Audi RS 4 vs. Mercedes-Benz C63 AMG (caranddriver.com)
Tested: 2007 BMW 328i vs. Cadillac, Infiniti, and Mercedes Rivals (caranddriver.com)
2010 Luxury Sports Sedan Comparo (caranddriver.com)
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