Yes they are, but for single bevels you should consider honbazuke (first sharpening).
In UK we offer full service whetstone sharpening, repair, and restoration services for your knives. If You are buying a new knife from us just select a option and our master sharpener will make your blade sharp. Please have in mind that initial sharpened knives are non-returnable.
All double bevel knives are sharp so there is no need for initial sharpening (honbazuke).
This is mostly recommended for single bevel as double bevels come pre-sharpened.