The neck pickup is dark and probably gets replaced with a Duncan Full Shred neck.
It did get replaced
and for me it is a definite improvement - it is brighter but not only that, it is much more "present" or clear.
I also replaced the bridge pickup with a Duncan 59/custom hybrid that I made myself from a 59 and a Custom. The reason for the change was primarily cosmetic because I wanted both pickups to have open black coils and I don't like the looks of one pickup covered and one uncovered much. The improvement in tone is minor to my ears.
I also replaced the original pickguard so that I could leave that basically untouched and got a new one. I used a multipole 5 way switch instead of the original 3 way and wired it up like this:
#1 bridge coils in series
#2 bridge and neck outer coils in parallel (tele-like tone)
#3 bridge and neck in parallel
#4 bridge and neck inner coils in parallel (strat-like tone)
#5 neck coils in series
Volume is a 500k pot (actually measuring 480k). Tone is a 500k push/pull pot with which I can put both pickups in single coil mode. As a result, I have retained the individual humbuckers split as in the stock set up.
Inner/outer coils on 24 fret guitars is useful to me. On a 22 fret guitar, they do not sound much different to my ears so with those I would go for a different set up.
If I install a push-pull for the volume pickup to be able to split the pickups separately, I could also get the bridge HB + neck SC and bridge SC + neck HB that are found on newer PRS guitars but I am not sure how useful these are.
Cheers Stephan