Honestly there is no real alternative to BMW the closest thing Audi but Audi's are probably even more douchey then BMW at this point.
The Audi styling has picked up lately but I wasn't a fan of driving a luxury car that looked exactly like a Jetta / Passat.
I've never driven an A8 but the a4 / 6 drove like ass compared to 3 / 5 series.
Plus they are fairly douchey. Get it in white for extra douche.