I'm not the best with understanding some of the more complicated computer terms but is the OP suggesting that the 3ds is more powerful (graphics wise) than the Wii U? If so that is really impressive! To be honest I've thought Mario Kart 7 on 3ds looked better than Mario Kart Wii for a while now. However, Ocarina of Time 3d did not look nearly as good as Twilight Princess for Wii.
You should check out Puzzle Swap in StreetPass Mii Plaza, like such puzzles as:
I already have. Why do you say that though?
Because they really show off the polygons & shader cores (you can use the circle pad to move the camera angle around). But so do the games I tagged to this thread for showing off the graphics.
The Mario Kart 7 puzzle seems like a fully develop Mario Kart 7 if they had had the time. I guess I shouldn't be surprise that Mario Kart 7 still looked better then Wii despite being a rush developed game for the holidays.