"Leaders have relentlessly high standards."
"Tell me about a time you refused to compromise on quality" or "Tell me about a time you raised the bar."
Strong answer: your team was about to ship a feature with test coverage. You pushed for because the feature handled payments. It took extra days but caught bugs that would have cost thousands in incorrect charges.
This pairs well with Deliver Results (LP #). Show that high standards don't mean slow delivery. They mean catching problems before they ship.