Hi, this is possible. Please take a look at documentation page. In order to see diff revisions in a review you must use revision slider.
However, if you're looking for a way to see a diff per changesets, it is not possible at the moment. Feel free to raise feature request on jira.atlassian.com if you'd find such feature useful.
Thanks for signing up for Jira Ops! I’m Matt Ryall, leader for the Jira Ops product team at Atlassian. Since this is a brand new product, we’ll be delivering improvements quickly and sharing updates...
Connect with like-minded Atlassian users at free events near you!Find a group
Connect with like-minded Atlassian users at free events near you!
Unfortunately there are no AUG chapters near you at the moment.Start an AUG
You're one step closer to meeting fellow Atlassian users at your local meet up. Learn more about AUGs