Audi, BMW, and Mercedes stir up drama with crazy-expensive and insanely quick four-doors masquerading as coupes.

In response to the question “How do you make a 600-hp sports sedan?” Audi, BMW, and Mercedes-AMG have turned in answers so similar that if this were an exam, they’d be accused of cheating.

The brands started with the bones of a buttoned-down sedan and crafted a version with a narrow-eyed performance-car glare, a dropped roofline, and a sloping tail.
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