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?
Tesla Model 3. It’s sort of an unbranded B&O system. They hired ex B&O engineers. Honestly it’s so good, and I drive so much for work, that it’s actually a large decision factor for me for a future car even as much as my car can annoy me at times.
https://insideevs.com/news/366089/tesla-model-3-amazing-sound-system/
Model Y takes it to the next level with the open hatch by allowing that subwoofer to breathe. I’m actually pretty impressed with the bass compared to the 3.