Papa John's International reported a slight increase in Q4 comparable sales growth by 0.1%, with a notable 11% rise in global system-wide restaurant sales growth. The report highlights a mixed performance across different segments, with domestic company-owned restaurants showing a 2.2% increase in comparable sales and international restaurants experiencing a 5.5% decline. The year-end figures also reflect a varied performance, with a slight overall decline in comparable sales but a significant improvement in system-wide sales growth.