The old V1/V2 Pickups were designed by Dimarzio, similar to those "Duncan Designed" pickups you see in inexpensive guitars. They were just cost effective alternative to putting in full priced Dimarzio pickups in it. The V2 should be modeled after the Super Distortion but with an Alnico instead of Ceramic, can read anywhere between 12-16k. V1 is a generic neck/lead pickup that should be somewhere around 9k, no one really remembers or knows which pickup that one is modeled after.
They're alright for stock pickups, some folks think they really scream, but I've found in the older Ibanez's the specs on these pickups are realllllly out of whack. You can get a good set or you could get a crap set. In my humble opinion, there are a lot better options out there today than keeping them in there. If you like the Dimarzio route try out a Tone Zone/Air Norton or even a Crunchlab/Liquifire (which is becoming my "go to" pickups for Ibanez guitars).