If Fahrenheit: Indigo Prophecy Remastered generated the same gross revenue on the Epic Games Store, Quantic Dream, Aspyr Media (remastered version) would keep approximately $1,833,261 - that's $470,440 more than on Steam.
At this revenue level, Epic's concrete platform fee would be $113,626. 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 $1,362,821.
Note: This is a hypothetical comparison. Actual sales volumes differ significantly between platforms, and Steam's larger user base typically drives substantially higher sales.