In reply to TMM:
That will presumably be the newer version rather than the original that came out in 1999. The inferior replacement abandoned some of its virtues in order to compete with the mighty 911 and, like so many cars before, was sent packing with its tail between its legs. The original was no larger in the interior, but offered a sensuous and sporty coupe shell that made it popular with younger car fans. Michael Owen (not that I value the company of footballers but he fits a certain youthful profile) was an early adopter, as was I at the age of 34. I usually keep my cars for a year or two. I kept that Jag for six.
Like you, I don't like the later version, nor much of Jag's modern output, especially the Dubai-aimed XF.
Audis are efficient and reliable and some of them are comfortable, if you can avoid anything claiming to be sporty or s-line. They have superb interiors and competent if rather dull exteriors (except for the hideous A5 and the stunning but disappointing to drive R8) but none of them are designed for pure driving pleasure. For starters, none are rear wheel drive. You clearly know a thing or two about cars so you'll understand why that is important, and therefore why my first (budget no limit, tongue in cheek) recommendation was the Porsche Panamera. I might have suggested an M5 Touring but the OP said no to BMW. And comfort seemed to be a priority.
I haven't tried an A7 and I'm sure it is comfortable and coasting. But it isn't inspirational as a choice. Autocar praises it as a "rapid, luxurious, hi-tech and stylish cruiser" but lambasts "its inert handling and desensitised steering", which kind of sums up what I'm trying to say. The Phaeton recommended elsewhere on this thread is more inspirational for the crazy ambition of the car, a mass volume shopping car manufacturer building a Rolls Royce. Bonkers and therefore wonderful, and probably very cheap second hand.