Biggest leap forward from a system to its successor

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Vinther1991 said:

Mega Drive to Saturn closely followed by SNES to N64. If Switch is considered a successor to the 3DS, then it wins by a mile.

Nice to see Sega get a shoutout; the jump from 2D to 3D was monumental for them as well, even if the system didn't have the same impact that the N64 did.

Saturn to Dreamcast was also a massive leap considering the came out only 4 years apart.