If Far Cry 4 generated the same gross revenue on the Epic Games Store, Ubisoft Montreal, Red Storm, Shanghai, Toronto, Kiev would keep approximately $38,795,357 - that's $6,333,405 more than on Steam.
At this revenue level, Epic's concrete platform fee would be $5,153,912. 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 $30,764,489.
Note: This is a hypothetical comparison. Actual sales volumes differ significantly between platforms, and Steam's larger user base typically drives substantially higher sales.