Acura, Infiniti, Cadillac, and Lexus have their work cut out for them, because the current contenders for best mid-size luxury car are all very compelling. They also all happen to be German. Audi, BMW, and Mercedes-Benz rule this sector, if not in terms of overall sales, then at least in terms of perception. Executives and engineers from the other makers consider the A6, the 5-series, and the E-class benchmark sedans. But which of these three is the best?
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