I've had the QS sushi in Japan and it's pretty good! If it won't destroy your schedule, I think it's worth swinging by.
If you have time, he best sushi on property is at Kimonos, IMHO. You can get sushi in the lounge at Cali Grill (though it's mostly rolls if I recall), but it's not great. They use way too much rice in the rolls, IMHO.
I'm originally from Lancaster!