[Viffermike]

Hate to say it, but there are several glaring A/B deficiencies in this test that completely void many of your conclusions. Among them:
- Playback source. To properly judge sound quality, the source should be the same. Exactly the same. By nature, the systems in the VW and the BMW will be different. For all you know, the perceived inaccuracy of the Dynaudio may be attributable to the DAC in the VW system.
- Wattage figures. Channels and wattage in car audio are not directly comparable in several regards because one system may feed one channel that drives, say, the front-door midrange driver one wattage figure, while another system will feed that same channel and location another wattage figure. Plus: are those wattages RMS or peak?
- Volume. Amp power is only one factor that contributes to this. Speaker sensitivity, ohm rating, proximity to the ear are all also factors. None are considered here.

The "preciseness" you may be hearing in the HK may simply be its DSP bias toward lower mids and lower highs -- particularly through the HK tweeters, which are known to approach Focal levels of treble harshness. Some ears read that as 'crispness' and 'preciseness' when the opposite is actually true, particularly when one thing that you note happens: the Dynaudio system can handle lower lows. That tells me that the Dynaudio amp could very well be feeding more power to the lower end at the expense of mids and highs, which require far, far less power to be clear.

Another telltale that the HK is not accurate: vocals. You note that vocals are more clear through the Dynaudio system. A poorly balanced system will reproduce vocals unevenly, to the point where lower frequencies drown vocals out. The HK system reportedly does this badly. Apparently, the effect on the Dynaudio system isn't as pronounced.

It's a nice writeup, but seriously flawed. Use at your discretion.