The wing is extraordinary, a highly swept super critical airfoil whose sweep is rivaled among civil airplanes only by that of another very speedy model with a slightly greater payload, the Boeing 747.
There's little competition for the airplane, but then again, the Citation X+ doesn't fit a niche so much as a need.
That need is of course for speed, but with comfort, range, sophistication and more thrown in to sweeten the deal.
The X+ offered a good cabin, though it was tight in some respects. Legroom in the club seating areas could be less than ideal.
Headroom, on the other hand, was (and is) quite good.