Oooh. I always thought that battle really should have been the finale of doom. The first and best cyberdemon. It's so much more epic than Dis and the spider. And you know it's some serious shit coming your way when you start in that room in the middle with the barons of hell on the walls, your first indication that something worse was beyond those walls. It's like the spider mastermind kind of should have been a semi-boss and the cyberdemon the final one, everything after Tower of Babel was anticlimactic. Of course in doom 2, they had the icon of sin, as you depict here. But that was kind of a copout too. They needed to have a new one that was live and not just a hole in the wall with John Romero's head behind it, and unique to that level. And a new weapon beyond the bfg in the starting room which existed only in that level. And cyberdemon corpses nailed to the walls of the starting room! Granted the weapon beyond the bfg would have required modifying the game a lot, but they should have done it, that's what it really needed there at the end, another "things just got real" realization when you start in the starting room of the last level.