I find ydiff more useful, specially for the side-by-side output: https://github.com/ymattw/ydiff

I'm using it like "git-ydiff-s" script in my PATH to use "git ydiff-s":

    #!/bin/sh
    git diff "$@" | ydiff -s --wrap --width=0

Installation is "sudo dnf install ydiff" or curl -fsSL https://raw.github.com/ymattw/ydiff/master/ydiff.py > ~/bin/ydiff chmod +x ~/bin/ydiff # (and change to python3)