To me, pots have a big impact on how the sound is overall, and changing this may take something that's meh to good. Not all CTS pots are created equal either; of the ones which came in my SG (w/ P90s), only one measured 500k, two 470 and one 410. Overall the guitar sounded a bit duller, also since it was wired up modern style, so, loss of high end when turning the volume down.
In the end I got a set of 550k pots and wired them up 50s style - much better: more overall clarity, high end and dynamic sensitivity. Like taking a blanket off and This is a place I usually start before deciding to buy a new pu. Other folks may prefer something else, but since we're trading opinions/experiences here, my 2 cents.
What is the difference between modern and 50s wiring? Are they wired different or do you mean like vintage spec like paper and oil caps etc...?