"Currently, Sony posts the maximum download file size for all of its digital games, and those download numbers includes all of the European language packs. The 37.8GB file is the total file size for the English, French, German, Italian, and European Spanish packs, while the 20.5GB download includes the Polish and Russian language options.
"While Ultimate Evil Edition has been localized in English, German, French, Latin American Spanish, European Spanish, Japanese, Russian, Italian, Polish, and Brazilian Portuguese, we expect most players will only be playing in their preferred language and so only downloading about 15GB to play the game."
That should be a relief for storage-conscious PS4 players in Europe. Diablo 3: Reaper of Souls - Ultimate Evil Edition is due out on August 19.