I don’t have much experience in high-end luxury cars but I have owned a spectrum of brands from European,domestic and Japanese manufacturers.
Honestly I have never been impressed by a factory system. The H/K in our older Mercedes was a joke. We all know Bose is a gimmick. I’ve heard the Fender systems are pretty good but I’ve never had the chance to demo them.
The best I think I’ve heard is the Logic 7 in BMW.
What are some of your favorites?
The Fender system in my old Volkswagen Tiguan 2016 was by far the best I’ve heard in a car. Way better than what I’ve heard in much more expensive cars.
Apparently the Fender name was just licensed by Harmon Kardon.
Worth checking out this thread, you can see my comment and the person that responds to me that describes the Fender / Harmon Kardon relationship.