Bloke I work with had his A8 in for warranty work and they lent him brand new A8 4.2tdi. Phew what a car .It had every extra on it anyone could dream of ! Night vision (weird but useful) ,google connectivity for maps etc thro' the Sat Nav, blinds, camera for parking and thats just for starters. Interestingly the engine is cleaner than even the latest 3.00tdi with lower tax band.It goes like stink obviously and has all the latest quattro gizmos.But you know what it disappoints in the looks department.The old version of the A8 look better IMO.
Now if Audi would put that 4.2 in the A4 whooooooo