Mercedes GLC300e ... the car is awful, so awful in fact that MBUK are buying back off me after a year of none stop issues that MB cant fix. One of the few things on the car that is good is the Burmester stereo.
Picking up a Lexus RX450H+ on Monday with Mark Levinson stereo and I believe they are meant to be very good. Not had it blasting on the test drive though.
Above are company cars, private car has Aston Martin premium audio, not sure who makes it, used to be Alpine but not sure on the one I have but it's OK, not great though.
Having said all this, I mainly listen to talk radio programs in the car rather than trying to get the best sound for music.