With rivals getting better and brawnier, what does the new Audi A4 do differently to woo luxury sedan buyers? For starters, it does pack a more powerful 40 TFSI petrol engine and gets a new 10.1-inch touchscreen MMI display. But is it enough to take the fight to the likes of BMW 3 Series, Mercedes-Benz C-Class or the upcoming Volvo S60? We drive the 2021 Audi A4 to find the answer!