Had an 04 Plate XJR briefly a year or so ago (may have been longer), they're massive on the outside, although on the inside I didn't find it big at all, and I'm really not of an acceptable height to be commenting on size issues, however the supercharged V8 is an astonishing engine 400 BHP and ultra smooth however when I once pushed hard for a while, 7 odd MPG average wasn't good. My E60 5 series I would say was bigger inside, very comfortable and I never spent a penny on that. I'll get hated for this (as I do for anything BMW related but ho hum), the 7 Series is leaps & bounds ahead of the XJ in my opinion, the drives is miles better, the 231 bhp 3.0 diesel in the BMW is excellent, it's massive inside (Short Wheel Base), the LWB is even bigger, although some 7 series come stupidly equipped. Either way for me it'd be a 5 Series or a 7 Series, however the Volkswagen Phaeton is quite a forgotten car and it's extremely well built.