Total Commander

Compare By Content:
a left+right side-bars which marks the changes would be great.
Almost any other compare software has this bar, and it really is helpful.

like in here:
http://support.softlanding.com/opensource/site/images/overview/compare-3.png

Currently the changes are marked via a red line number. Isn't that sufficient?

2ghisler(Author)

Isn't that sufficient?

Such a sidebar would definitely help.
In addition a special color for the background for differences would make the file comparision more usable.