How does the Audi A8 handle in slippery conditions?

I'm worried about driving in snow and rain. How does the Audi A8 performance in these conditions?

In snowy conditions, the Audi A8's Quattro all-wheel drive system provides excellent traction and stability. Just be sure to equip winter tires for maximum safety.

The Audi A8's standard electronic stability control system helps you maintain control in rainy conditions by detecting and correcting any loss of traction on individual wheels.

Audi's optional dynamic all-wheel steering system allows for better handling and stability in all weather conditions, giving you added control on slippery roads.