I didn't purchase anything yet...and my lease runs out this weekend! Might just rent a car until the end of December for end of year deals.
I took a test drive in the A8L and it was nice but just not sporty enough for me. The rear legroom seemed a little cramped....but it was quiet and one smooth ride.
I also didn't like the NAV control wheel being so high on the dash. Unlike then A6/7 and BMWs, you couldn't use it with your arm on the middle armrest....