Festin would have trounced Zenyatta ... Zenyatta's own sire Street Cry... also didn't come around fully till age 4 like her .. but Street Cry would have absolutely demolished Zenyatta.
STREET CRY
The difference is that Zenyatta is running against sheer equine filth of the female variety ... and Street Cry and Festin ran against excellent top older males like Left Bank and Sakhee - and In Excess, Farma Way, Unbridled, Black Tie Affair etc.
Festin needed a very fast pace - and only really got it once. He was hindered in the Black Tie Affair Classic by a slow pace.