The electronics (other than the 3EQ addition) have not changed since their introduction. The same circuit is used and the same pickup. Music Man has better quality control and far superior craftsmanship now than it did in the 70s...I really don't understand this G string issue, or the 'not cutting in the mix' issue. I don't have this G string issue, and I play in a metal/rock band, a soul/funk band and in the huge musical bands (2 pianos, horn section, sometimes 2 drummers, 2 guitarists, whole cast of vocalists...and me and my stingray) The 'cut' is probably the main trait of the stingray, that's it's thing, it cuts in every situation. The pickup produces masses of mids, maybe that's why people like the sound of the 2EQ better...because they have not scooped all the mids out.
But, as metallica would say: 'mids are for pussies!'
No, metallica, mids are our friend.