The upgrade tool displays version revisions:
The revision is not really useful for the end user but can be a great piece of information for support. Considering support will often only receive the tool output, we cannot afford not showing the revision.
A good compromise (thanks Fabio Pistolesi and Chris Ridd) would be to use short hash versions and to use square brackets to improve readability:
An alternative would be to only show the revisions in upgrade.log file and to hide them in the console output. In case the upgrade fails, a message should remind the user to send this file to support.