Yeah i was surprised also, but i remembered expension pack on N64, and the RAM flushing of the menu on the O3DS, it's a nintendo habit to give more memory to games after some times, pushing the console to it limits, the price to have a freakin huge draw distance on such a "not powerfull enought" console,
i did my search, the game is the same on both console exept for the resolution on dock mode, BUT, the game is ported on switch and have framedrops that the WiiU doesnt even have,
so here it is, the max power that WiiU have is a 350km² map with shitload of grass/trees/mountains and huge draw distance without agressive clipping, and that impressed because it manage to have an avg of 25-30fps on most case... quite unbelievable for such old tech.