Anyone that thinks that CD "quality" is good is either too young to remember what really good hifi is all about OR isn't an audiophile.
Problem is modern music and its mastering just doesn't tax the medium. Analogue records and tapes do indeed sound better than a CD.
For most people, a CD sounds better and is better because a tape player that costs the same will have inferior sound. A CD can't hold a candle to a good deck such as the Nakamichi Dragon. Now if we compare phonographs, the same argument will hold true.
Most audiophiles will balk at the term CD Quality. With decent equipment (DAC's and processing) the resolution limitation of 16 bit medium can be made more bearable. It still can't hold a candle to 20 and 24 bit audio. 24 bit 192 kHz audio sounds so much more open and defined than a CD it's not funny.
Obviously one would choose the most rugged and portable format in the car. Of course, the car is a very hostile environment in the first place.
Musical storage and playback is much more than signal to noise ratio and frequency response, folks.
Cheers!