You are comparing the X6 (E71) with DPC to the E53, and drawing conclusions based on the X6 performance. Yes, the difference was noted in a post above, but it is the defining difference in the two models (apart from the E71 engines). The original poster's question was about the X5 (E70). The problem is that as far as I know, the DPC system on the X6 is not available on the X5. BMW is using that traction control system to differentiate the two models. So, it is comparing apples and oranges. The E70 has essentially the same x-Drive system as the post-2004 E53s. We can talk about response times in the DSC system, but at the end of the day, I think it really comes down to tires and weight. Tires can be made to be equal, but the E70 is still heavier, and weight is the enemy.

There is also a comment that the additional ground clearance of the E70 will make it better handling than the E53 in poor conditoins. I disagree. It has a higher centre of gravity, and that will give it worse handling, all other things being equal. The additional ground clearance only matters in deep snow, and it is only marginally different. Snow conditions will matter more than the small difference in ground clearance in my experience.

Kungen, I agree with you on the all-weather capability of the X5. No question in my mind, it is a very capable vehicle with the right tires. Most of the discussion on the limited capabilities of the X5 on this forum and others is about off-road driving, where ground clearance and other issues come into play.

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2007 X3 3.0si, 6 MT, Premium, White

Retired:
2008 535i, 6 MT, M Sport, Premium, Space Grey
2003 X5 3.0 Steptronic, Premium, Titanium Silver
2002 325xi 5 MT, Steel Grey
2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue