[JustSomeNobody]

> How long it took somebody else in your team to solve the same problem

I don't think that is a good measure. I know many developers who want to solve everything fast because fast is productive in their eyes. The problem is they end up having a bug or three and spend some back and forth time with QA. So, now they didn't actually solve the problem fast and they wasted QAs time. I prefer to get a more holistic understanding of the code before fixing the issue and not get any bugs back from QA. In retro, when the QA tells the team how many bugs there were, I am proud when I'm not a part of that count.