Consider the 2010 XK a two-seater, like its high-rolling competitors. There's just not enough room to promise anything to anyone behind those slim, comfortable front buckets.
Coupes have more headroom and legroom than the previous XK, and the long seat travel will give most front passengers the foot space they need. Still, the rear seats are nothing more than upholstered package shelves, even narrower in convertibles.
The trunk is a slim 10 cubic feet in coupes (really, hatchbacks) and shrinks to less than 8 cubic feet in convertibles with the top down. Blame the XK's high cargo floor and low-slung glass and decklid, but you'll have to leave some luggage at home.
Instead of griping, spend some time admiring the details and construction in the cabin: the glossy, deeply grained wood, the stitching in the leather, the plush carpeting. You could spend twice as much on some Italian sports cars and get an interior with poorly fitted, pedestrian trim.
Cars.com: "nearly nonexistent legroom" in back
Edmunds: "It's better than the 911's backseat, but that's pretty faint praise"
Cars.com: cockpit "is very hushed on asphalt surfaces at highway speeds"
Cars.com: "the trunk, at 7.1 cubic feet with the top down, isn't very big"
Edmunds: "The XK coupe's trunk can hold about 11 cubic feet of cargo"
ConsumerGuide: "an inviting ambiance"