Francis stands on the shoulders of far greater men (and seems unworthy as their successor) like Pope St. Pius X, Pius XI, Pius XII, John Paul I, Pope St. John Paul II and even Pope St. John XXIII if you limit the analysis to his heroic work saving Bulgarian Jews from the Nazis as a Vatican diplomat to that country.
And his efforts were in addition to the heroic Bulgarian people, largely Eastern Orthodox, who laid down across the railroad tracks to prevent the cattle cars filled with Bulgarian Jews from moving the Jews to the death camps until the Nazis there simply gave up.
St. John XXIII saved, many, many lives.