To be fair to the Gamecube in this thread however, most gamecube ports were not done well and were simply "souped up" PS2 ports
I'm sure if for instance with the Splinter Cell games more love went into the GC ports, we'd have seen better graphics than what we received.
GC wasn't well treated by third parties, especially most western third parties.
RE4 was an example of pushing the GC and I remember the lighting & particles, never mind textures, in that game looking much superior (like a great deal superior) than the PS2 version.
But with say the Splinter Cell games, they just looked like straight ports from the PS2 versions.
edit: ah yes, this
GC (L) - PS2 (R)
Personally, I especially remember the lightning part in the beginning of the game. That was the first time I was able to tell a huge difference between the two versions. Didn't make the PS2 version unplayable by any means, just meant the game should have been played on the Gamecube the way it was meant to be