vim diff - only display differences in lines

Hi,

1. I have two list of users like in file1:

user1

user3

and in file2:

user2

user4

2. I open first file:

:e file1

2. Open second file

:vsp file2

3. Do the diff between files

:windo diffthis

Diff is displayed as differences between files:


But I would like diff to be displayed as "line is missing" principle like this:

Both list of users are sorted, so it should be visible which user is missing on which user list.

How to force vim to display diff in "line missing" principle?

Thanks

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