My personal experience is that, if doing so specifically as an upgrade to enhance tone, it will yield absolutely nothing. Your guitar will sound exactly the same afterwards. That said, if doing so because one or more of the pots are getting scratchy, replacement will end the scratchiness, and high-quality pots (like CTS) will last a lot longer than many stock Epi pots. Same for doing it as a preventative measure. In my case, pots were getting scratchy after only about 3 years of light use. All has been stable with CTS pots ever since (4+ years).
Epi often uses 500k audio taper for tone, 300k linear for volume, and .022uf tone caps. From what I can tell, many folks upgrade their Epis (as I did) with all 500k audio taper pots. I don't think caps are anywhere as big a deal as some assert - aside from value, a cap is a cap.