EWJ is liquid but it does NOT mirror N225 like a $JPDOW. I think it was created more for marketing and fund expense purposes. How can a Japan ETF managed by M.S. geniuses underperform N225 by +8% in 3 months?
http://finance.yahoo.com/q/ta?s=^N225&t=3m&l=on&z=l&q=c&p=m200,m50,m200,m50&a=&c=ewj
http://finance.yahoo.com/q/ta?s=^N225&t=3m&l=on&z=l&q=c&p=m200,m50,m200,m50&a=&c=ewj