That is the subject of the most recent email I got from Japanesepod101.com. I bet everything would be fine, I've been over to Japan 4 or 5 times and thought it was quite fine indeed.
I loved the sushi there of course. 2nd for quality sushi would be Korea then a distant 3rd, the US. It is fresher as expected. I've been told they put maybe a bit of vinegar in the rice and somehow get it fluffier. Whatever they do, it's good!