I own a coupe, have driven 3 different xf's before buying mine though & everyone of them pulled to the left & needed correcting when driving.....mine does it a little to especially when the road has a camber....I've had a trusted mechanic go all round mine & he said it was rock solid.
I think xf's are not the best steering cars in the world & do tend to have a mind of there own at times, but once you get used to how it drives they really are lovely cars to own & drive, I love mine & it's so easy to drive....& thus far been cheap on parts, I had a few niggles with mine which I knew when buying hence I got it at a lower price, but I've put all the problems right for not that great an outlay.