"monolingual person he might consider a C2 (European Framework) level" I speak one foreign language at a solid C2 level, but I also scored in the 99th percenti

"monolingual person he might consider a C2 (European Framework) level" I speak one foreign language at a solid C2 level, but I also scored in the 99th percentile on the GRE verbal (USA's English Language grad school entrance exam for native English speakers). I never feel fully fluent in that foreign language, even when I can pass language exams most locals can't. There's simply to way for me to match my fluency and comfort with English. So I agree; the standard for fluency is always relative. And -- contrary to superficial appearance -- even native speakers have a wide variety of levels of competence and you can always benefit from studying more.