Just like its Q5 and SQ5 platform mates, the A5 and S5 use a 2.0-liter turbocharged I4 and a 3.0-liter turbocharged V6, respectively. The A5’s 2.0-liter mill throws 268 hp and 295 lb-ft of torque, ...

It used to be sedans, but the new luxury battleground is fought with luxury SUVs. So does Mercedes rule the roost, or does ...