As a 1-2 PQE lawyer, how do I know if I am learning as much as my learned friends in the profession that has the same PQE as me?

I want to make sure that I am capable of handling my own cases in the future so I want to learn as much as possible while I am still young and prone to mistakes.

Also I come from a small firm who can punch above its own weight, pay is decent 5.5k+ after called but not that much work to do which is why I am afraid I am not learning as much while my peers in big 4 firms may be learning more than I am.

Any advice?