http://www.dailygame.net/news/archives/006696.php
"Still, as strong as Call of Duty 4 is shaping up to be in the gameplay department, the most immediately impressive aspect is by far its graphics. The PC, PlayStation 3 and Xbox 360 versions all look surprisingly similar, but that's not due to one platform being the lead; Infinity Ward personally assured us that development occurred simultaneously on all three platforms, and that there wasn't a base system. With that said, the console similarities end when it comes to textures, lighting and resolutions, because those three areas make the PlayStation 3 version definitely excel over the Xbox 360 SKU. Regardless, every console owner will proudly use Call of Duty 4 to showcase their high-definition TV, because COD4 is by far the best-looking console game you will see this year."
Good to see that this won't be a low quality port. :)