I forgot to mention the Kia Stinger! It seems like the perfect fit. The shape of it is like the Audi A7 or Tesla Model S, a fastback. The driving dynamics are very good and the interior is nice. It has a 10 year/100k mile warranty whether you buy new or CPO. The GT2 AWD trim is probably the one for you. I drove one and was very impressed by it. Before you knock it because it is a Kia you should drive one. It should be pretty reliable. It has a lot more usable cargo space than any sedan.
The Genesis G80 is also a good one. You could get a Genesis by Hyundai for very cheap since it has a Hyundai badge and they are almost the same car. They are definitely more comfortable than sporty, so I'm not sure it it is for you. It is one of the few reliable luxury cars on the market however. I really liked it when I drove it. They have the same warranty as the Kia.
I agree with you on buying a car from the Detroit 3 brands; I'm not a fan of them either. I have always thought the A6 was more of a big luxury cruiser and not a performance car, but maybe I'm wrong. I don't think the Jaguar would be a good buy. I had a Jaguar that I sold the month the 3 year warranty was up. I liked the car, but couldn't stand spending $500 every month to retrieve the windows that always fell into the doors and the water pumps that would explode. Resale value is terrible, too. The Lexus seems like a nice balance of luxury and fun (and reliability), but a little more comfort-minded.