One thing that makes traditional Japanese knives different from western knives is the fact that many types are honed only on one side; the right side. For a left handed person, they would have to special order the knife honed on the left side.
This single sided honing allows one to create the sharpest edge possible on a sushi knife. Much sharper than can be accomplished with a traditional western style knife which is honed equally on both sides and are known as double-edged knives.
If you are just starting out, whether at home or at work, knowing which sushi knife you will need or what each is used for can be confusing.