Fugitive comes with a pretty sick way to commit files and see the diff at the same time with verbose commit. Opening the fugitive menu with :G brings up your git status, you can stage files with s, unstage them with u, toggle them with -, and toggle their diff with >. Once you have staged your files for commit, you can commit with cc, but today I found that you can commit verbose with cvc. This brings up not only a commit widow with your git status shown, but the diff that you are about to commit.

fugitive verbose commit example

example of a verbose commit in fugitive