This is what I ment about size:
(20cm wider and almost 1meter (3ft) longer)
When I parked my volvo V70 next to it one time (and that is a big car, similar to an audi A6 avant) I found out that the FF even dwarfed that.
The specs on the FF are of course absolutely unbelievable. There's nothing that comes close in that class (the panamera turbo S is probably it's closest rival but with 4 doors)