K.O. offers some pretty standard sushi items. They have a modest yet good selection of sushi and soups. They have a couple good vegetarian options like the V3 roll and the vegetable undo soup.
The place is a small take out with no seating directly outside. However, right up the street is Romare Bearden Park! Weather permitting, it is great to sit at the park and eat lunch.
Compared to other sushi joint in center city K.O. is dramatically more affordable. You can easily get full on sushi for under ten bucks. All and all a great place to grab some lunch on the go.