Darashiva on 24 July 2018
Final Fantasy VII to IX was already mentioned, and I consider the latter to be the best looking game on the PS1, but another big leap from the same generation would be Tekken 1 to Tekken 3. On PS2 series like Jak & Daxter, Ratchet & Clank and Sly Cooper all had a pretty big jump in graphical quality over each trilogy.
