How to Git diff two branches but showing an output similar to that of Git commit?

If I do:

$ git checkout some_branch
[...]
$ git diff another_branch

It'll show a large diff between the branches.

Now there's a simplified, smaller¹ diff shown after applying a commit, or merge, I guess cherry picks too.

How can I show that smaller¹ diff when diffing two branches one branch from another branch?

_{1: Because format, not because contents.}

I found what I was looking for, at the manual page.

$ git diff --stat master

Will do what I need (having checked out the feature branch am diffing).