I can confirm that most of today's websites look worse on the new iPad than on iPad 1 and iPad 2.
Yeah, I have the new iPad in hand and you can definitely tell that all the images are not as sharp as the text. This problem is fixed on apple's website because it loads in new retina images just for the new iPad.
If apple finds a need to update their website, I'm sure other websites (especially those targeting iPad users) will update their images, also.