Hi Patto, can't help much with humbuckers but I can make a direct comparison between the middle pickups from a Strat style guitar. (Tonerider City Limits vs Entwistle AS57-M). One of my ST's is ash body and maple fretboard the other basswood and rosewood, both use CTS pots. To my ears (admittedly stuffed from years of abuse) there is hardly any discernible difference. I did a quick and dirty comparison with my looper pedal and the output of both is similar with the tonerider being perhaps just a tad brighter.

But in a real world comparison of, play unplug/plug play, it would be hard to tell any difference.

I have made a direct comparison between my PitBull ST with Tonerider City Limits and a mates $2,500 Fender Strat through the same Marshall Amp, and we both agreed that they sounded the same.

Hope this helps.
rob