NA v EU has happened 6 times: 100T v FNC, XSET v FPX, 100T v FNC again, OPTC v TL, XSET v FNC, XSET v FPX again. The score should be NA won 4 and EU won 2.
Also the top four team at Reykjavík earlier this year (OPTC, LOUD, ZETA, PRX) were also from different regions.