Oct 14, 2006 · The A6 feels huge compared to the A4. My parents have the A6 and I have an A4. I'm a fairly short guy at only 5'8" but I feel like I can just recline in the back of the A6. The A4, my knees are almost in the back of the front seats. The A6 is also a lot more luxurious on the inside. If you need a bigger car, go with the A6. Feb 10, 2021 · Audi A4: The A4 is a compact sedan with front row leg room of 41.3 inches and front row headroom of 38.9 inches. The second row has 35.7 inches of legroom of and 37.4 inches of headroom. The trunk eTfzky.