If Yakuza 4 Remastered generated the same gross revenue on the Epic Games Store, Ryu Ga Gotoku Studio would keep approximately $3,046,988 - that's $718,702 more than on Steam.
At this revenue level, Epic's concrete platform fee would be $279,135. Epic charges 0% on the first $1 million in annual per-app revenue and then 12% on the remaining amount. On GOG (30% cut), the developer would earn approximately $2,328,286.
Note: This is a hypothetical comparison. Actual sales volumes differ significantly between platforms, and Steam's larger user base typically drives substantially higher sales.