6L6 vs EL34

It was pointed out to me the other day that it would be easy to convert my amp, a stereo PP EL34 amp, to run 6L6's. I've never really listened to the 6L6 tube before do any members have any thoughts on 6L6 tubes vs EL34's? I am running the Genalex KT-77 re-issue tubes in my amp and love how it sounds now. Thanks!