I've finished the Pripyat stage of COD4 - I reckon the best part of COD4 until now, and you have to appreciate the fact Pripyat on COD4 resembles Pripyat on Stalker.
So:
1. Which looks better IYHO (in terms of "real", giving you the city's feel, not just graphically wise)?
2. Which did you like best as a fight?
I have to say, IMHO, for (1) about the same; but for (2) Stalker.