I no longer have any vintage guitars but I do have 4 vintage amps (Brown Face Deluxe, Brown Face Vibrolux, Black Face Vibrolux Reverb, and a Black Face Deluxe Reverb).
I can't acknowledge that a vintage guitar sounds better through a vintage amp. But I can confirm, that ANY guitar I own sounds better through my vintage amps verse new amps. There is a more 3D quality to the vintage amps. They sound like the sound is coming from 180 degree and don't sound boxy like a lot of newer amps I have played/owned over the years.