C2 - CECRL, m.n.: The level of perfection or the perfect level to be at. If you can come and enjoy a relaxing beer with one of our English teachers in a London pub, talk about just about anything, be witty and understand jokes, make prolific use of double meanings, word plays and other figures of speach... If when coming home you can write up your pub experience in the form of a publication grade short story, make it entertaining and stylish and spell all the words correctly... Then, well yes, your level must be C2 on the CECRL scale !
Et si vous ne vous sentez pas (encore) capable de faire tout cela. Alors sorry mate ! You are not quite there yet.