Unlike probably everyone here I have driven these cars back to back. On different roads and for a full day.
The Audi A8 has a wonderful interior but - even with air suspension - the ride and handling are terrible.
The Lexus has every option in the book thrown at it but that doesn't stop it feeling like a cheap copy of a luxury car.
The Mercedes interior feels slightly downmarket, the ride however is very good but means the helm feels detached. I was the most excited about driving it but ultimately, it left me the most disappointed. What ARE they raving about? I think like most people though - the three pointed star in front of you just makes you feel good.
The BMW felt the most rounded. The engine and drivetrain are awesome. There are flaws, sure, but it's SO much better than the prevous model.
I don't agree with the ride critisisms, in comfort mode it is as good as the Mercedes.
I do have a slight problem with the styling, a Mercedes S Class does it much better.
BMW have a bad image generally I think. It's undeserved. The 7 series is a good car. Good enough to win the public vote? We'll see.