I'll reply too, on the basis of my own subjective experience.
To me, this model should be named "Flat Response" rather than "Wide Range".
It has
not extended high frequencies because of a robust inductance. But it has a more EVEN spectrum than
most Gibson style humbuckers.
When it comes to harmonics and touch sensitivity in single notes, it's somewhere between regular HB's and SC's: its screw poles having a weaker magnetism than AlNiCo rods, it's not so agressive, nasal and bright than a Fender SC, even in single coil mode. But it's clearer than a normal humbucker, albeit with less focus on the resonant peak and therefore, more sonic space for other harmonics. Hence the "hi-fi" perception, that I personally attribute to the softened resonant peak, a bit like with a single coil whose tone pot would be lowered to 6.5/10...
If I keep talking about P.A.F.'s (that I write with dots because "PAF" without dots has been registered as a trademark by DiMarzio), I'll end on a very ironical paradox: to me, a Wide Range has MUCH in common with a real vintage Gibson HB from the 50/60's... As if it was an attempt to recreate by different means in the 70's some qualities typical of early P.A.F.'s.
Which would be logical since the Wide Range has been designed by... Seth Lover.
I share below two pics showing neck pickups played in chords from unfretted strings to the 12th fret, direct to the board.
This first one is about a CuNiFe Wide Range vs a modern (and to me mediocre) Gibson neck PU:
The tighter bass and low mids of the Wide Range can clearly be seen and the pickups have comparable treble responses because they have in fact the same inductance: 4.8H (even if the WR has a DCR of 10.34, illustrating once again how DCR can be misleading).
Here is now a comparison with a vintage Gibson Patent Sticker (7.3k):
The "wider" sonic "range" actually comes from... the P.A.F. successor and it's normal since this pickup has a lower inductance (3.9H) than the Fender WR.
But the WR has the same kind of even bass + low mid response, avoiding the syndrome of the boomy neck PU...
In short, how WR's compare to Gibson style HB's appears to depends on the era evoked. IMHO. IME. YMMV.