Be in a class of your, its, etc. own - Idioms by The Free Dictionary
be in a class of your, its, etc. own
be in a class of (one's)/its own
To be completely superior to others of one's or its kind. As a lawyer, Janice is truly in a class of her own. The reigning Super Bowl champions continue to play as if they're in a class of their own. The newest car from Ferrari is in a class of its own.
be in a class of your, its, etc. own (also be in a class by yourself, itself, etc.) be much better than any others of the same kind: The winning competitor was in a class by herself. ♢ For originality, Leo’s designs are truly in a class of their own.