Actually we don't really have so much lag to justify an advantage by japanese players. Instead, by official interview, we now have an official problem: packet loss
Finalfantasy14.eu (14EU) : Have you done any tests on the latency for the version 2.0? I suppose that you've noticed that the Garuda Battle has not really been taken on by European players because of latency. French players think that the Ifrit Extreme is impossible to complete due to latency issue, and they are afraid not to be able to do the relic quest before 2.0 hits.

Yoshida : We have completed the tests and research, and we did find out that the whole issue is based on the access route: there's some packet loss, and this is the cause for the lag European players face. We are going to make sure not only French players, but all European players can have a great experience for the 2.0 version so please wait for an announcement we will be making in the future, we can't address it at the moment but we're definitely taking steps to make sure this will be solved, please be reassured.
http://forum.finalfantasy14.eu/viewt...hp?f=20&t=2338
Yep, it isn't lag but network structure. 2.0 bitches