According to the Wikipedia article on TOPIK, the TOPIK level 1 to 6 is equivalent for CEFR A1 to C2, respectively. However, I'm quite doubtful of its comparison, especially because many Japanese passed TOPIK 6 but never even close to the C2 standard, I think.
HSK score comparison on Mandarin Chinese is often criticized and it is considered that the HSK 6 (highest level) is equivalent for B2 (which I agree).
But the TOPIK score seems to be on par with CEFR from 1-6 to A1-C2, and I have never seen any argument on it. But I still think, the C2 is too high for TOPIK 6 holders. Also, given the number of participants of TOPIK 6 and the standard of CEFR C2, it is strange that TOPIK adapts even to such a high level of language learners.
So my question is, is the level 1 to 6 of TOPIK considered on par with CEFR A1 to C2, or is there any argument in Korea that opposes to it, which I might not get to in English?