I used to own a bright red Alfa 147GTA, since then I'd never really had the urge for another red car. In fact, when I got the RCF, red wasn't even on my list of options until I saw one. The sonic red (though a pain to maintain) is, in my opinion at least, awesome looking in the sunshine - way better than it looks in pictures.
That said, I don't really get it on a carbon. I find the marked contrast to the bonnet a bit jarring. A grey one though, that looks pretty sweet, but to each his own!