Sogi-Ya: there is nothing in what you said that remotely relates to what I experienced with COP. not saying that you are not getting the performance you say you are, but it may be an issue with you PC instead of the game being shitty ....
One of the biggest issues is the draw distance. I'm not even the only one complaining about it, according to a quick Google search. I got 516m at best, which looked like vanilla Morrowind. I then set the graphics to maximum, which dropped it to 300m. Curiously, "maximum" settings didn't include setting the draw distance to max, but even with the slider pushed all the way to the right I got around 398m. It freaks me out because NPC's appear out of nowhere. Literally; they don't gradually appear from the fog, they are simply rendered in when I get close enough.
My recollections of Quake 4 looked better than CoP, and that game is five years older.
Thanks, but I think I'll pass. SoC was underwhelming and CS downright unbearable to me, so my interest in the S.T.A.L.K.E.R. series is pretty much nil. CoP, or what little I played of it anyway, felt dated (not just because of its graphics) and generally not very interesting. It's not like I haven't got other games to take its place.