Ability to view size on disk difference of modified files

We are coming from a centralized source control repository and adopting Git. One thing we loved about our old tool (SourceGear Vault) was that for our modified files, it showed us the difference of the modified file's size on disk compared to the current version in source control. This was helpful for us and provided some context on the size of the change we made to each file. 

For example if one file has +10kb of changes, then we know that is a significant change and should be reviewed closely before committing, where as a +1 byte delta would tell us it was a trivial/minor change to the file.

Having the ability to also sort on the file size delta was helpful to get the most significant changes (largest deltas) grouped together before committing, helping us see the biggest changes in one spot rather than sorted by filename or by folder. Sometimes we'd catch a 'console.log' statement in a file when sorting by size as well, as that change would be around +18 bytes to a file, which is easier to detect and remove before committing when sorting changes by size.

See screenshots for where this would be great in SmartGit, and how it is displayed in SourceGear Vault: