Similar to what JEverly stated, finding the right combos is key. I'll give some examples of pickup swaps that have made each of these guitars more exciting to play.
Schecter Solo 6 Custom (Gibson style)
It had Seymour Duncan Customs' pickups and sounded good. Put in JWP Jim Wagner Pickups Darkburst (bridge) Godwood (Neck) and it kicked it into high gear. More tone and a bit brighter.
Further, I previously put these in a cheap Kramer and they worked phenomenally as well, but I couldn't get over the neck's discomfort on my left hand.
PRS SC Goldtop
Original pickups sounded very nice (I think they were their 57/08 pickups), but once I put in Wolftone Marshallhead and Vintage pickups, it sounds even better. Now, this swap might be more psychological than the others. Their customer support is great as well.
Gibson Les Paul Studio (as I mentioned in another recent post)
Stock 490T pickups sounded bland and dark. Put some Mojotone humbucker sized P-90s and the tone and warmth significantly increased.
Gibson Les Paul Traditional Pro II (2014)
I think they were Burstbuckers, which sounded OK, but a little too bright and brash. I put Rio Grande BBQ's and it smoothed out the sound so well. I had read that Rio Grandes tend to be a bit darker, and in my experience they were and paired nicely with this Les Paul.
I had tried the famous Seymour Duncan JB/59 set in this guitar as well and it just didn't inspire me as much. Perhaps the output was a little too low.
Hope some of this helps!