Furthermore, James Cameron had a bank of about a million computers rendering each frame of that movie, and to think that hardware could all be pressed into a console a few years later is a bit of a stretch.
The ILM guys have a deep fascination with real time rendering (30 frames per second rather than potentially long render hours for 1 frame) and the LucasArts guys have loved exploring what is involved in rendering photo real characters and environments, and we can significantly increase our rendering fidelity.
Snow Leopard appeared consistently quicker in time-based tests, with faster bootups, shutdowns and MP3 encoding, but Windows 7 showed its muscle in producing better frame rates in games and a significant advantage in Cinebench rendering.