wow, what a carcrash of a thread.
i dunno, i think that any form of fluency in 11 languages is pretty impressive. I don't see any real basis to start putting this guy down, anyway. He seems to be doing good 
Whether other people are doing better or not isn't really the point, is it...
Anyway, about the difference in difficulty levels of languages, i think a lot of it has to do with how different the grammar structure is from english, not just how much of a vocabulary head start you get.
Like, there's differences with French grammar too, but i get the impression that it would be much quicker to attain listening fluency in French because the grammar structure is so much more similar to english than it is for Japanese, which means your brain should not take as long to start processing whole sentences, i guess.