Here's my take on the whole tech demo vs game technical prowess thing ...
Tech Demo:
- Has Realtime Local Reflections for glossy surfaces such as the floor
- Materials react to light more grounded to reality and it appears to be using a blinn-phong shading model
- Has higher resolution textures
- Higher detailed environments
Game:
- Bigger environments
I don't think either of them are impressive technically speaking but if I had to pick the tech demo was simply better on the technical front and it was simply nice to see the WII U being capable of realtime local reflections and this is coming from a PC gamer so to speak ...