Here are 4 examples of knives you could use for slicing sushi. Long, thin and sharp knives are the best. This first knife is long, thin, incredibly sharp and costs about $500. This one is also long, thin and sharp… it costs about $100. This is a regular chef’s knife, which is very sharp. And the third is a $4 Wal-mart special… It will do the job because the blade is very thin and sharp. See how it’s thinner than the chef knife… * Longer knives are preferred for slicing sushi.