How to compare different branches in Visual Studio Code

How do I compare different branches in Visual Studio Code 1.9?

Is it possible?

2021 answer

Here is the step by step guide:

1. Install the GitLens extension: GitLens
2. Then, Click on Source Control:

3. Click on Search & Compare

4. Click on Compare References

5. Select the branches you want to compare:

6. Now, You can select any file for which you want to see the diff from Search & Compare

Update: As of November, 2020, Gitlens appears within VSCode's builtin Source Control Panel

I would recommend to use: Git Lens.

UPDATE

Now it's available:

https://marketplace.visualstudio.com/items?itemName=donjayamanne.githistory

Until now it isn't supported, but you can follow the thread for it: GitHub