> gitk -> Visualize current working directory / branch only.
> gitk --reflog -> VISUALIZE YOUR REFLOG! OMG! Thanks @Stjaertfena
> gitk --all -> Visualize current working directory & ALL branches (both local and remote).
> gitk --remotes -> Visualize ALL REMOTE branches only.
> gitk --remotes=origin/cd_* -> Visualize SPECIFIC (pattern-based!) REMOTE branches only.