The new Cadillac deVille is a fine automobile about the same size as the new Mercury Marquis. But out of 30 individual tests of automotive qualities, the Marquis won 26. And was rated superior overall by 37 out of 50 big-car drivers.
Mercury Marquis vs Cadillac deVille: How they tested the cars
Mercury Marquis vs Cadillac deVille test results
Test program results: Styling, ride, driving, quality, convenience, 6-passenger comfort, superior overall