Inside the XK, everything is roomier. The seats have more travel, and there's more room for humans in all directions. Everything inside is new, from the new shifter with a Sport slot to the new dashboard and instrument layout, to the standard touch-screen navigation system.

The seats have undergone a major redesign and they are much the better for it, with longer cushions, more power adjustments, more enveloping bolsters, and generally more long-distance comfort built in. They're upholstered in Jaguar's traditional leather, of course, and set off by the buyer's choice of walnut veneer, poplar veneer, or aluminum trim panels on the doors and dashboard.

The instruments have brand new and more engaging graphics, the layout is better, and the switchgear makes more sense now because of the opportunity to redesign it.

The XK was built up from the idea of a 2+2 roadster. The coupe came after the more complex disappearing hard top design, also as a 2+2. We appreciate what Jaguar is trying to do here, but the rear compartment simply doesn't have room for the average American occupant. Purses, backpacks, briefcases and satchels, maybe, but not real people. At least not very large people, and not for long distances.

All the controls and switches make sense, especially if you're used to Jaguars. Things work pretty much the same way as the previous XK8 and XKR. The new navigation system is big, bright, colorful, clear and useful with a minimum of fuss.

None of the other coupes and roadsters in this small luxury sports car class are exactly swimming in cargo space, and the XK doesn't move the needle here, either, with 10.6 cubic feet in the coupe, 10.0 cubic feet in the convertible with the top up, and only 7 cubic feet with the top stowed.

Dealing with the XK, working its works, discovering it system by system, was a pleasure. No surprises, no weirdness. We did find the A-pillar to be thicker than we'd like, interfering with our vision in some driving situations, but other than that quibble, the car was quick, quiet, comfortable and easy to use, with strong kudos for the touch-screen design and interface

Driving Impressions

The 300-horsepower engine in the new Jaguar XK 4.2, newly outfitted with variable valve timing and other improvements for both power and fuel efficiency, wouldn't be competitive with other sports cars in this price range if the new car had a steel body and 700 pounds more weight. But with only the 3600-pound body and chassis to carry around, the engine is pretty darn good. It sounds especially mean and nasty at full throttle because of some extra valves and plumbing in the exhaust system, especially with the convertible top stowed. In sixth gear cruising, though, it's a near-inaudible pussycat.

The new six-speed automatic with manual control, a Sport mode, and shifter paddles on the steering wheel, is about three levels of sportiness better than the outgoing transmission and the old, dreaded J-gate shifter. The new twin-clutch transmission allows extremely quick, positive shifts between gears, with little or no lurching on upshifts and a nice, growly throttle blip on downshifts. This is an improvement on the similar ZF transmission Ford uses in the Aston Martin DB9, now with better hardware and software. It can sense aggressive driving and adapt accordingly, limiting upshifts in long corners in Sport mode, and giving instant multiple downshifts when conditions are right.

The engine/transmission combination is good for about 5.9-second 0-60 times and 14.4-second quarter-mile sprints, according to Jaguar, with an electronic speed limit of 155 mph. Interpolated European fuel numbers are comparable to EPA numbers of 16 miles per gallon city, and 25 miles per gallon highway, thus no gas-guzzler tax to be paid.

Hugely stiffer than the outgoing car on the basis of its riveted and bonded aluminum construction, almost 50 percent stiffer in bending and much stiffer in torsion, the XK offers the kind of silky smooth ride and demonic cornering that great sports cars have always had. It's helped by the completely retuned CATS adaptive suspension system with faster-acting, smarter shock absorbers that work with the engine and transmission to immediately react to the situation and driver's intention. The tuning is roughly 10 percent stiffer in the front and 4 percent stiffer in the rear than the old car. There are several assist modes to the CATS system, including completely off, for track days.

Another byproduct of the stiff chassis is the steering accuracy. It's without question the tightest, heftiest, and quickest Jaguar power steering in history, but nowhere near the point of skittishness. Solid, stable, and planted. The traction control system now features a Trac mode that keeps everything on but allows a higher threshold of yaw, letting the car get sideways in corners for those owners who go to Jaguar Club track days.