Ok, here's my two cents on this.
I have owned both Gibsons and Epiphones. From hand made Ren Ferguson Gibson custom shop acoustics and vintage Les Pauls to
Epiphone Les Paul Custom Black Beauty to my current
absolute favorite guitar the Epiphone
B.B. King "Lucille".
I have been playing since 1955. Both as a touring musician and recording session guitarist and studio owner.
Let me say that for the most part, Any Epiphone model usually needs attention to the frets, action,intonation and electronics. Untill recently with the higher priced ones, they need new pots and switching. The newest alnico pickups are fairly decent but should still be replaced with whatever quality pickups your personal "ear" and amp require.
Example...Jason Lollar Imperials, Gibson 57 Classic's,Tom Holmes humbuckers..ect.
My Lucille when I bought it new was sent to the Legendary Mike Forrester of Forrester Kustom Guitars and had all the pots replaced with N.O.S. CTS audio taper ones, Switchcraft switching and jacks and the frets leveled,dressed and polished.
After this was done I would put it shoulder to shoulder with any Gibson I have ever owned.
Yes, the poly finish on the Epiphone does not compare to the highly labor intensive and costly hand rubbed and pains taking Nitro-Cellious finish on it's Gibson counterpart which is a huge reason for the price difference. Also the Epiphone uses metric sized hardware compared to the standard grade & sized used on the Gibson.
But the Gibson and the Epi are both made from laminated Maple back,sides and top, maple neck. Both are completely bound on the body,neck and headstock. The inlay work appears to be of the same quality. The Gibson has an ebony fretboard where the Epiphone has a rosewood one. Both have a bone nut and the Gibby has Gold
Keystone tuners verses the Epi's Gold Grover kidney button ones.
I have had a Fender Squier Pro Tone Strat that was second to none of the American models I've owned. That was made in Korea and was just a great Strat by the way. Once again the comparison of the "lesser" headstock name verses the "accepted" headstock name.
At the end of the day, a small investment in upgraded electronics, pickups(possibly) and some fret work and the Epiphone will provide any good working musican with a great guitar for about 2000.00 less money unless one has "Headstock Insecurity" and has to have a certain manufactures name inlaid in it.
If you have that God given gift of the talent,hands,ears and musical soul then any decent well set up guitar will give you the avenue to pour your talent out to those that wish to hear it.
Below are pictures of my "Lucille" and my Epiphone Black Beauty LP.