Not a popular opinion around here, but in every blind test I've seen, people have failed to not only identify different pickup installed in the same bass, recorded the same way and level matched, but they also have failed to recognize WHEN there was a change of pickup. Even those who a priory claimed there was a major difference after a pup change, completely failed in those blind test.
Goes to show that people listen with their eyes and inject a great deal of emotions into what they hear.
I'm not talking about going from passive to active, or changing the pup position on the bass, but strictly changing passive pup.
What I gather from that is that changing pup is a big waste of money.
It's also been my own experience. I once did the whole pups dance thing, and I finally concluded: Why spend money on pups when turning a knob a mere 1/8 of a turn on an EQ will have drastically more impact on tone?
I spent quite a lot of time scrutinizing a ton of demo videos of a specific group of Precision pickups (some of them individual demos, some in head to head against a wide selection of similar type Precision pickups), and whenever possible hands on experience with instruments housing one, or other of the pickups I was interested in.
Over time I built up a clear picture of what to expect from each individual pickup, within the group I was interested in (and wasn't too surprised to find that the TB consensus tended to align, in terms of tonal descriptions - for example comparing the CS62 with the PV63).
I was pretty content to have finally figured it all out.
I then, quite by accident stumbled across a couple of really excellent videos that compared either all, or most of my shortlist of candidates.
I was pretty shocked.
When compared side by side, in the same instrument, in the same mix context, there was barely any discernible, or at least meaningful difference between the PV63, V-Mod II, CS62, or EMG GZR (and I think the Seymour Duncan Antiquity).
The only ones that had a noticeably different voicing, were the standard wind Lindy Fralin, and the equivalent Lollar (and I think a late 50's style, but I forget which), although they sounded almost indistinguishable from each other - it simply boiled down to two different style voicings.
That really shook my world, because even though I'm generally perfectly happy with the pickups I already have, I was resigned to the fact that I'll probably replace them with a more classically vintage pickup at some point, and was expecting to stick with a Fender made (probably CS62), or Fender '62 inspired (GZR).
What it's confirmed to me is that I generally prefer late 50's voiced (comparatively underwound) pickups, but beyond that, the differences pale into insignificance compared to strings, preamp, microphones, contextual requirements.
I'll probably end up with a Fralin at some point, as it has my favourite voicing, and character, but over the years I've read conflicting descriptions by Fralin himself, on his website, as to whether his particular pickup is 50's inspired, or 60's inspired (at varying times, the same product has said both, and recommends the use of a .022 tone capacitor) - all of which is a really long winded way of saying I still haven't got a clue, but Fralin pickups are great.