Biggest leap forward from a system to its successor

[UnderwaterFunktown]

NES to SNES for sure. There are barely any pre-SNES games I consider good.

While the introduction of 3d is ofc technically impressive SNES to N64 was honestly a sidestep imo, on average I'd say the games got worse but a few (OoT and MM) really outshined what had come before. Then the GameCube was another huge step forward where the average quality improved significantly.

The leaps for PlayStation consoles have been more gradual as I see it, but they've never felt insignificant either (perhaps not counting PS4 to PS5 which is too early to fully speak for).