Credit where credit is due, it's the Project EQ team that work on the database and quests
http://www.peqtgc.com/ . There is overlap with the EQEmu devs, but they are not always one and the same.
They are "only" up to GoD, and given their attention to detail and high standards that's pretty amazing. If you log into the PEQ server, your server should have the same content.
The choice of client won't affect the content available on a Project EQ based server, but might do on custom servers that use the new zones.