Japan's taking over as a volume leader. Today its top exchange (coincheck) has 7922 BTC volume, but coincheck isn't even on bitcoinity. The only working JPY exchanges on bitcoinity are the kraken and localbitcoins.
Japanese volume doesn't get mentioned so much, but it's the one that's been on the ascendant. Bitflyer FX has done nearly 50K today, although they are currently zero fee, so...
Coincheck charges fees so its volume is *probably* real. Coinmarketcap has put it at third place for volume today. It's put Bitflyer into the exchanges marked with a * because they don't charge fees.