Rated Speech Samples
What does it sound like to be Level 4, 5 or 6?
Not an easy question, but as a Level 6, you typically sound authentically good, like you are mastering the language in every situation. You are well versed in vocabulary and grammar and consequently show confidence, resulting in fluency and easy-going interaction.
And what about Level 4 or 5? It is best to listen to actual exam recordings. Check out these official speech samples from ICAEA, the International Civil Aviation English Association.