For Champaign, the sushi and ramen are definitely the best quality on campus. The waitstaff is decently nice, and the ambiance is really cool. I would definitely pay a couple of extra bucks for the ramen here, rather than eat super mediocre to bad ramen elsewhere.
The sushi rolls are pretty good, really fresh and flavorful. I like that they have character, like the VIP roll. I also LOVE the Willis Tower (even though I hate the name). You get to smash it and enjoy the spice and salt an deliciousness. The salmon and tuna platters are also worth the price, very fresh.
The tonkatsu ramen and shoyu ramen are my favorites. Very good flavorful broth and tender not overly cooked noodles with many toppings.
I would DEFINITELY recommend the twist potato and the friend chicken. Be warned the spicy chicken is very spicy, and the garlic is sweet and salty. They are juicy, crunchy and overall delicious. Pretty big too. They're only served late night though.