how does the wii nights compare to the saturn nights graphically?
Well "technically" speaking it would blow it away, but that would be silly

. Graphically, Journey of Dreams adds a lot more depth to the levels, but it doesn't mirror the floor and sky like the original, which kind of departs the style, but overall it does a decent job recreating it. I thought the music, sound, and controls reflected the original game very well though.
The music is inferior to the first game.
Probably, but not by much I'd say. I think JoD really did a good job recapturing the musical style.