As the bestselling model in Audi history, this all-new 9th generation A4 shoulders great responsibility. Compact sedans do much of the heavy lifting for luxury marquees and Audi considers the A4 representative of the best in every detail the brand has to offer.In this crossover-happy world, the Q5 is by far Audi’s most sought after vehicle but on the car side of the ledger it’s still the A4. Popular German competitors from BMW and Mercedes-Benz double up the A4’s sales, but those who’ve experienced the joy of four rings know they’ve made the right choice. With greater street cred than xDrive or 4Matic, quattro all-wheel drive has long since been the A4’s ace in the hole and my tester is so equipped.