I had not seen the link offered in post #9 before, and just gave it a quick once over … after getting stung more than a few times with purchases early on, I made it a mission to educate myself on 'modern era'
passive Fender basses … there are a few things in that posted link that should be expounded on and clarified ..
There are in essence,
4 era's of MIM Standard Jazz basses … with regards to OP inquiry, I will mostly touch on electronics and major changes with each era …
MIM Standards were introduced in '91, and for the first year, some of the specs/details/components possibly varied a bit (this is Fender) … from then on, they were poplar bodied, and used two neck sized ceramic magnet pups (app. 3.60" in length), which were mfg'd for Fender by Cort, part #36437, split-splined shaft pots, under press-on Strat style knobs … this continued in production through appr. June of '01, for what was called the '01 model year ..
The next 'era' began appr. July of '01,
for the 2002 model year, and was probably the biggest era change to take place for the MIM Standard Series … body wood was now alder,
pickups were now conventional Fender Jazz size, with neck shorter/bridge longer (appr. 3.60"/3.74"), part numbers were 58294/58295, and were identifiable by the raised A and D pole pieces, still ceramic magnet … the change was also made to solid shaft pots, and conventional 'top hat' style Jazz bass knobs … this era ran through appr. June of 2005 (2005 model year)
The next 'era' began appr. July of '05,
for the '06 model year, and the big changes here, were the switch to medium jumbo fret wire on the necks,
fully shielded electronics for reduced hum, and Fender began including a gig bag with purchase … all electronics stayed the same as previous era … this era ran through appr. June of '08 (2008 model year)
The last era of MIM Standards began appr. July of '08, for the '09
model year … changes here were mostly aesthetics, but there also seemed to be an overall attempt to improve consistency in the model … Fender began using a heavier tinting on neck/headstock, and a switch was made to 70's style headstock logo, which also moved the serial # to the back of the headstock … the same hardware/electronics/specs as used through the last 'era', just changes once again in finishes offered … this era ran through to the end of MIM Standard series, until it evolved into the current Players Series ...
Hope this helps clear things up … there is a LOT of confusion on the MIM Standard Series, comments (pro and con) without noting what generation they are speaking … the early era models are a LOT different from later, both in components, specs, and consistency …