....I've played them both when I first got my Epi Std. The Standard had just a hint more sustain probably 'cause of the maple top. The Studio's body is mahogany/alder. The Std. has binding on the body and neck, which is just for looks. The Studio doesn't. Big Deal!
The Studio does come in Sunburst finishes!
Check it out. http://www.epiphone.com