Length:
F1 - 4287mm, XJ220 - 4928mm
Wheelbase:
F1 - 2718mm, XJ220 - 2642mm
Track front/rear:
F1 - 1568/1472, XJ220 - 1710/1588
Interestingly, with its impressive five-meter length, XJ220 has a smaller wheelbase than rather compact F1. I think this will allow Jaguar to be no less maneuverable in twisty corners. And the large rear overhang allows to place a massive diffuser, which gives a definite advantage in high-speed sweepers.
It's a pity we don't have a direct comparisons on the circuits, I think it would be a nice fight. Jaguar is faster in the corners, McLaren on the straights, I think the winner could be different depending on the nature of the track.