paavillisempi kuin paavi itse

Finnish

paavillisempi (“more pope-like”) + kuin (“than”) + paavi (“pope”) + itse (“himself”)

(simile) more Catholic than the Pope (supporting someone's ideas more vigorously than the person itself)
olla ~ : to outpope the Pope (to try to act as a more authentic member of a group than one who is a genuine member of the group)