It seems the 2015 flu was limited to the US, while this one has hit Europe and Asia hard too. The global markets might have softened 2015s price impact, see how exports from US dropped and imports increased: https://www.statista.com/statistics/196095/us-total-egg-impo...

With very little additional detail, this says it's worse than 2015: https://foodinstitute.com/focus/bird-flu-cull-surpasses-2015...