Sony has released a video comparison of Chains of Olympus and Ghost of Sparta running on the PSP and on their HD remastered collection on the PS3. The differences are quite notable.
Nathan Phail-Liff, art director at developer Ready At Dawn Studios also talked about how difficult a task it was to remaster the PSP God of War games.
You can read what he has to say via the link below.
[Source: PS Blog]