Not the conversation I was expecting to see here, my buddy and I were talking about this the other day lol.
To start the black plastic covered "IBZ" pickup is DEFINITELY its own thing; and is not comparable to anything else (design wise). Its definitely higher output than a normal V2, and I think sounds better. I opened one of mine up just now, so you can see what I mean
It has 3 magnets and is fully coated in epoxy resin. That thing aint goin anywhere lol. (which is a tragedy, because these plastic cases are super tacky really). It has a maxon style 3 screw height adjustment setup, and its unfortunately part of the plastic ... why they did that? No clue. Great pickup though, I personally think they are superior to the "Ibanez Vintage" In discussion, and certainly better than V2's. Cheap as hell too (probably due to the EMG esque look they have Id imagine).
The "Ibanez Vintage"... this one is interesting lol. This pickup ALSO uses the maxon style height adjustment setup; and it too is also a bit more output than the V2. This may sound silly, but ... I really want to say these are basically super 70s. Obviously, when people talk about super 70s they are usually referring to the maxon ones, but ibanez made them as well in house after some point. Since the RG440p was the "budget" version of the 540p, I dont think they were best served advertising a renowned pickup like that; but Im honestly guessing of course.
I have taken one apart, and it has a ceramic magnet. The V2 has an alnico 5. Different pole pieces too
For the sound qualities youre after and comparing to the vintage; I'd recommend you have a look at Dimarzio Transition (DP255) or Dimarzio Breed. Transitions are incredible. They have a full bottom end without being flubby, and despite not being very treble focused they are extremely articulate and dont get muddy at all. The breed is probably the most under rated pickup ever imo. Its "hot" but its not like the evo where it feels like im driving nails into my skull with its absurd high end. The super cool thing about breeds is they sound incredible split (pos 2 thing); and for some reason they pick up harmonics like no other pickup ive played on.
In terms of "quality" (sound wise that is ) I would say, IBZ > Ibanez Vintage > V2. The v2 is mad decent for a stock "cheap" pickup; the other two are just a bit better to my ears. I unfortunately have no experience or knowledge of the "super 8" pickups (that the internet has zero information on lol).
Hope this helps