PC will always look better, no question. But as an X1 player, seeing the footage from the X1 showcase at e3, I'm not worried, still looks beautiful. I have W2 on both X360 and PC, and of course there were things that where obviously superior on the PC. Main thing is, if you can immerse yourself and have a great time playing it, does it matter.
^This.
The game looks good, and it's going to look even better when it's released. It's pretty silly to think that it is going to be downgraded.
It will look best on PC, no doubt about it, but it will also look as good as possible on the consoles, so that everyone will have a great experience.
I've ordered the game for PC, but I may also pick it up for my XBO, just to support CDPR.