My second Jaguar, and I love it even more than my first (a 1988 XJ6). The classiest, most beautiful car on the road, it handles perfectly (with the right brand of tires--Goodrich; Perelli and Michelein don't work well in wet or snow conditions) and has instant power. Extremely comfortable and fun to drive. Very comfortable for passengers front and back. Up-keep is expensive unless there is an extended warantee.
Exterior body design. Comfort and power. Responsiveness in handling.
Change standard tires to Goodrich for safety and responsiveness. Maybe an inch higher off the ground (front bumper sometimes hits six-inch barriers in parking lots).