What Fishy said. Location doesn't matter one bit. I just got back from Japan and besides the tuna in Tokyo and the mackerel in Kyoto, which were amazing, I didn't notice a major difference between the sushi at the absurdly expensive 2-Michelin-star place we ate at in Tokyo and the place near me in Brooklyn with $65 omakase. (I'm still pissed about what we paid. Rip-off.) We didn't eat at any cheap sushi places but they were everywhere.
Point being, there is fantastic sushi on the east coast (or in Chicago, for that matter -- there are these machines called airplanes that can be used to deliver fresh fish) and crappy all-you-can-eat sushi joints in Tokyo and LA.
I just out-sushi-snobbed the heck out of you.