Passenger & boot space
How it copes with people and clutter
Although the S6 has slightly less front leg room than the BMW 540i and Mercedes-AMG E 53, that's a bit like saying the Asian elephant is smaller than the African; the point is that both are big old beasts.
But the S6’s rear leg room is particularly impressive, beating both its key rivals for space in the back. Plus, accommodation for three adults sitting side by side is more generous, even though the middle passenger has to straddle a hump in the floor.