KoFusion is easily the best sushi in Champaign-Urbana. They have a wide selection of Japanese food. Also, on Sunday and Monday, they offer 10 different rolls for $1 each. It's absolutely glorious.
The atmosphere is also one of the best in Champaign-Urbana. With sushi this good, I would be satisfied with a hole-in-the-wall location. However, KoFusion is classy! There are tanks of fish, complicated ambient lighting, waterfalls, and many other clever design elements.
HIGHLY recommend.