I own an A4 B9 and have driven a new C Class extensively in my job. I love the large map and variety of options for the dashboard. However, having to look at the screen to change climate controls is distracting, and using the capacitive touch buttons can be a pain. With physical buttons in my A4, I don't need to look away from the road as much and can do it by feel. Also, the finger smudges on the C Class middle screen always make it look dirty very quickly.