My 300E has 117,000 miles on it and is about to turn 18 the suspension is still original with the exception of the tie-rods and ball joints which were replaced about 1.5 yrs ago.

I recently went on a road trip with a friend who happened to rent a 2009 B-Class, which is also a compact car like your A4.

I bet that the suspension on the B-class is state of the art, but as far as ride comfort goes, my W124 seems to do a much better job at absorbing road imperfections . with the B-class you can practically feel every bump in the road, which from experience seems like a characteristic of a modern euro suspension.

I agree with the above posters. In my opinion the suspension offers the best of both worlds, it’s firm, and offers good handling, while providing a nice smooth comfortable ride for the passengers.

PS
i have had a ton of people/passengers compliment the ride quality of the W124(a couple of friends have even claimed that the next car they buy will be a W124), so if you are not satisfied, it might be time to get yer hands dirty the suspension seems like its pretty simple to work on , and there is a ton of info on the forum