My jazz is now 8 months in on version 4 as far as pick ups go. There are no plans for version 5. Very satisfied with Mike Lulls custom wound Lindy Fralins hum cancelling. I do not know what the differences are to normal Fralins but they are mighty sweet. Respond wonderfully to eq and technique. low end is nice and tight, mids focused, top end is quite manageable. I feel that these pups truly make my jazz more versatile than others I've tried. so much so that the jazz now sports fender flats and P bass is relegated to back up role. Maybe it's time to put some zingy rounds on the P to have something totally different.
I've heard others rave of their Fralins much in the same manner. I hate to use the term vintage sounding. Yes they can do that, but so much more also. Like I said, very responsive. For me, that's what sets them apart.