FPS, draw distance and less aggressive pop in will make the difference. Running it in HD will reveal a lot more detail in the distance. I can't wait to be running around the vast landscape again.
And those ps2 screenshots look a lot better then it looked in 2005 on ps2...
http://www.gamespot.com/ps2/adventure/wandaandthecolossus/images/0/3/?tag=thumbs_below%3Bthumb;3