If Sid Meier's Civilization® V generated the same gross revenue on the Epic Games Store, Firaxis Games would keep approximately $94,490,430 - that's $11,699,130 more than on Steam.
At this revenue level, Epic's concrete platform fee would be $12,748,695. 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 $75,067,388.
Note: This is a hypothetical comparison. Actual sales volumes differ significantly between platforms, and Steam's larger user base typically drives substantially higher sales.