A typical command line is usually not wide enough to handle such a comparison. Note that most of Git is built for terminals with 80 characters. Thus, you will have about ~ 35 characters on each side; I doubt this is useful (I already have problems reading uniform differences on a much wider terminal).
Git, however, gives you the ability to use diff tools , external programs that can make any differences you prefer. For example, you can use something like WinMerge on Windows, which by default uses a split view. There are many other programs for it, for each platform, and usually each diff program can be configured to work with Git.