How can I find who edited all staged lines?

Question

I have a project that I need to code review (and fix), and I need to trace back who did it. I have edited all relevant lines in the project, and now I would like to see a summary of who was the last editor to these lines. I have a guess that it was all the same user, so I'd like some statistics.

I want to find whose lines I have edited the most in the currently staged lines (or commit, I am going to commit that anyway). I want a list of names that I need to count each user in, or immediately a summary of amount of lines (from the currently staged lines) that have been edited per user.

I have tried googling, but my Google-fu has fallen short.