Entry-level Luxury models are well equipped and the best value. Heated, leather seats front and rear, parking sensors, four-zone climate control and a touchscreen infotainment system with sat-nav are all standard.
Higher-spec versions simply pile on the kit by degrees with leather, larger alloy wheels, park assist and bodykits all featuring at some point.
The prime example here is the XJR. Available only with the most powerful supercharged V8, it comes with a model-specific bodykit, sports suspension, an active differential, four exhaust pipes and a 174mph speed limiter.
As ever, not only are these higher-spec versions expensive, but they also push the XJ into price bands that bring it closer to better rivals such as the Mercedes S-Class and BMW 7 Series. They also lose value much faster than the more modestly equipped, entry-level models.