The Naim system in the Bentley is very very good but I still reckon the best sounding in car hifi is the Meridian system in the Jaguar XJ (and probably new Range Rover too but not heard it in that yet).
Interesting how the article mentions the need to cater for younger generations like of 'thumping bass and crushingly repetitive songs'. Erm....yep, that'll probably be me then and it's good to see Bentley have consciously catered for this and disappointing AMG haven't (although B&O in the new SL is much, much better).
A couple of weeks in and I'm reconsidering whether my original statement of it now being the best audio I've heard still stands. I'll maintain that it's now very good but its just not, well, £5k's (+£1k's to fix it) worth and its bloody close between this, the XKR's Bowers and Wilkins (strangely JLR have totally moved away from this collaboration) and the BMW Individual system I had in my first e92 M3.