Your 'ALL' is somewhat inaccurate... miranda, ircle, trillion, virc are all major clients that are not listed as supporting utf-8, infact those few are more popular than most of the others than do support it (i said most not all).
On a similar note, how many of the irc-bots support utf-8? (ie eggdrop, energymech)
That being said, i have UTF-8 enabled and i dont believe i have ever not been able to read what somebody has said. Under what circumstances would somebody with UTF-8 enabled not be able to read text that they would be able to read is it was disabled?
