The 50 takes better pictures and can focus better in the dark. Haven't taken it to any concerts, but i've not had the focussing issues i had with my 20. Still loved that camera, but it was a chore at times getting focus, and in this respect the 50 is much better. The PDAF obviously was a step in the right direction from Fuji. But if you can get better kit for the same money then why not?