Over the years, I found out that a mark of big improvement over learning a language, is not how fluent you speak, is how well you understand while you are listening.
Can you tell the underlining message under different tones? Can you spot a pun when you hear it? Can you tell the different subtle choices of small words?
Those abilities can show how good a person has come to. Well, in the end, we are meant to listen more. We have two ears, but one mouth.