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?
Rolls have long been good, I know the man who designed all of their sound systems for a couple of decades. He was running fibre optic to amps in the boot in the 1980’s. The design he’s most proud of is the Vauxhall cavalier. It was designed so a sub could easily be added to a great sounding stock system.