Oh, forgot to answer the second part of your question, "is it good?"
Personally, I found the sushi to be not as good as what I get at home at my favorite sushi restaurant. They usually only have a couple of kinds, and none of it seemed to be true sashimi, but was mostly vegetarian or made with cooked fish. Definitely give it a try yourself, though, and see what you think! I'd love to hear your opinion of it when you get back.
If you are a sake fan remember that it falls into the wine category and is permissable to bring onboard. I just went to buy some for our Alaskan Cruise-good thing I did, I found out our favorite brand is ceasing production. Needless to say I purchased 2 cases.
It wasn't the best sushi I've had, but not the worst either. My son loved it, however and he's a pretty big sushi fan.
CarnivalSensation February 2015
Carnival Dream November 2015
Carnival Fascination April 2014
Carnival Elation March 2011
Carnival Imagination Sept 2007
Carnival Sensation Dec 2006
RCI Sovereign of the Seas Sept 2006
Carnival Miracle Sept 2005
Carnival Glory Sept 2004
Carnival Fantasy Jan 2004
"Is the sushi a "specialty" item that you have to pay extra for? "
I hope not! we're going to be on conquest next August (2005) for our 20th ann. and definitely looking forward to a nice sushi app. every night before dinner too!