Again this type of thread... PS4 is more powerfull hence can push more polys, effects, shaders etc... judging by past Naughty Dog work, it's easy that from a tech point of view it will be way ahead that whatever Nintendo can produce with the WiiU.
From an artistic point of view despite being more realistic, Uncharted4 seems to be very well designed too, so it's not a stretch to anticipate U4 as best visuals for 2015.
However will this make all other games look bad?
Pretty sure Zelda will have amazing visuals that will do what they are expected to do: amaze & immerse you in a wonderful fantasy Hyrule.
Pretty sure that BOTH will be contenders to best visuals for 2015!
https://www.youtube.com/watch?v=n29CicBxZuw
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