Mario Galaxy 2 (from what I've played so far) looks like it's in HD. I can't even say that about Mario Galaxy 1. SMG1 looked blurry and pixelated when I tried it a couple of days ago. SMG2 has impressed me since the pics and videos I've seen made it look like it was interchangeable with SMG1..
Anyway, to answer the question: Super Mario Galaxy 2








