Jack has custom-made 540s into which he chose to set EPs.
All preference, but the Edge is not per se better sounding or playing than the EP. Your hand that rests on the trem will decide.
The EP, although despised by the folks that grew up with the Edge, is probably the most progressive and functional double-locking trem out there: exchangeable knife edges, functional fine tuners, option to string without clipping off ball ends (good for gig emergencies), low profile that's comfortable to rest your hands on, plug-in trem arm, little rounded, string-saving sustain blocks...what's not to like.
You can slightly improve in your axe by adding locking studs, which Rich at Ibanezrules.com sells. But since most people don't even know how to lock any locking studs correctly they are at best a marginal improvement for many
. As TMatt142 put it, you won't gain anything discernible besides look/feel.
I am not very picky, but I personally favor the EP and Lo-Pro over the Edge for the profile alone.