the etek doesn't have qev's, it has banjo fittings. I have had the pleasure of building these at planet with Robert Pozderka and there is no difference, if there is it is VERY minor. the qev's really dont make much difference unless you are shooting stupid amounts of paint at stupid speeds. the normal player even on ramp modes will hardly notice any difference. that is what i have been told by the people who know about these markers.
hope this helps mate and the etek is a fantastic marker, you cant go wrong
Nige