Looking to surpass BMW and Mercedes-Benz, Alfa Romeo has launched an all-new compact luxury sedan—the Alfa Romeo Giulia. After revealing the rear-wheel-drive sport sedan at a small event in Italy this past summer, Alfa Romeo trotted out several examples at this year’s Frankfurt auto show.

So far, the Giulia has only been shown in its sportiest variant, the Quadrifoglio, whose name is in homage to the cloverleaf used on Alfa Romeo racecars since 1923. The Giulia Quadrifoglio is powered by a version of the 51…