From Wii to Wii U, the jump is bigger then last gen. Wii games look slightly better then Gamecube Games, and Wii U games, so far, comparable to PS4 games.
From PS3 to PS4, the jump is no more dramatic then DS to 3DS (ignoring the 3D effect). Yes there is a jump, but from what we've seens you're buying a PS4 (or a 3DS) because you were satisfied with the previous console and want more. There obviously will be new IP's, but a slightly better looking Uncharted 4 or GT6 is all you need to justify a PS4.
http://gamrconnect.vgchartz.com/post.php?id=5151304
See the difference for yourself.
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So my answer is non of the above. It's large for Nintendo, probably just as big as SNES to N64 or N64 to Gamecube. However for Sony, it's probably their smallest jump.
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