Is a revelation - Idioms by The Free Dictionary
be a revelation (redirected from is a revelation)
be a revelation
To be different than one anticipated, often in a good way. Dana's performance in the play was a revelation—I had no idea she was such a talented actress.
come as/be a reveˈlation (to somebody) be a completely new or surprising experience; be different from what was expected: His performance in the race today was a revelation to everyone. ♢ My trip to Texas was a revelation.