NES to SNES was just a refinement of capabilities, both 2D machines. - SNES Added rudimentary 3D capabilities.
SNES to the Nintendo 64 was technically and visually the largest leap. StarFox to StarFox 64 was massive... And they are comparably both 3D titles.
Nintendo 64 to Gamecube was also a refinement of capabilities with the introduction of propriety fixed function shading.
Gamecube to Wii was essentially just the same device, just overclocked with slightly more memory.
The Wii to WiiU brought forth fully programmable pixel shaders, but most of the added capability of the hardware got sunk into driving higher pixel counts anyway.
WiiU to Switch is visually a small leap, the Switch is capable of more "effects" than the WiiU and it's hardware is more efficient, but often the extra hardware gets sunk into driving higher framerates and/or resolutions. I.E. Breath of the Wild, Mario Kart, Super Mario Bros Deluxe, Mario 3D world, Tropical Freeze, Mario Party etc'.
Handhelds...
Gameboy to Gameboy colour was just colour added to the same 8bit titles.
Gameboy Colour to Gameboy Advance was like going from NES to SNES+Super FX.
Gameboy Advance to Nintendo DS wasn't as large of a leap as the SNES to the Nintendo 64 as the Gameboy Advance was faster than the SNES and the DS was weaker than the Nintendo 64.
Nintendo DS to 3DS was a refinement, but the 3DS wasn't solely relying on nearest neighbor textures either... And tended to have better shading effects.
3DS to Switch was a significant leap in every sense.
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