Graphically, I think we've come to a point that aside from things like frame rates and certain animation tricks, there isn't too much incentive to push things further besides being the developer that pushed things further.
The Wii U is capable of great graphics that could stand not to far from what we see on PS4 and Xbox One. The main difference is the power and complexity. The Wii U is no slouch but some of the more complex things like AI and certain other techniques are still beyond it.
All that being said most games that a developer or fan say could be done on the Wii U are full of crap unless it is working some super advance AI or a massive amount of NPCs that run on unique schedules in a giant open world setting.







