Audi’s most popular model gets a midcycle refresh but leaves us wanting a bit more. Just before 2020 ended, we had the chance to drive the 2021 Audi SQ5, the sportier variant of the Q5 powered by a punchy V-6 engine. Like we noted back then, the SQ5 delivers the best of both worlds. It's a comfortable SUV that's great for everyday driving, but also more dynamic when the road turns twisty. Now, we've driven and tested the 2021 Audi Q5, the toned-down normal version that competes in the compact-luxury-SUV segment, one of today's most popular. As you'd expect, then, the Q5 is indeed Audi's most popular model, making up 25 percent of the brand's sales, with the conventionally powered,…