Nope, right now the big difference is ESP vs Gimbals, and the number of guns. If you're in a little ship with little guns and fixed weapons, you're going to have a harder time getting on target. Whereas people with larger and more guns that are gimbaled can pretty much just point and click at you. Since ESP isn't staying on target, you have to maneuver less to line up a shot, which means that makes it easier for those who are mouse aiming to hit you. Also, ballistics penetrate through shields right now, so if they have ballistics (which AC is pretty much ballistic Sabres right now anyway), it takes less hits for them to kill you. Add to that, with Sabres, they're pretty much just as maneuverable than a light fighter, so you're not as likely to out-fly them.
There is one group that is dominating in fixed weapons (I probably don't have to say who). I don't know what their secret is. I mean, they're good, but that's godly...