Later I watched some GTA3 Xbox gameplay videos and noticed more differences: higher quality textures, pedestrian models with separate fingers and bone animations, real time reflections, specular highlight on vehicles and roads, improved vegetation, buildings with dynamic shadows imitation and awesome particle effects. He compared a car in all versions of Grand Theft Auto 3 and I was shocked after seeing how detailed Xbox model was.
I converted my first Xbox model on January 28 2009, after reading 'Differences between GTA 3 PC and XBOX' topic posted by Ghost Bear in GTAIII section.