Valve and their Source engine.
I don't particularly like how Source-based games look like compared to today's standards (as far as graphics are concerned) with the exception perhaps of Episode Two and TF2 (Portal 2 doesn't look bad either), but what makes Source superb is its scalability and its stability. I would totally exchange Skyrim's "Creation Engine" for it to be ran on Source just to make sure I don't get a single CTD. Additionally, the facial expressions and animations on Source have only been surpassed by L.A. Noire to this day. And heck character models can look awesome on Source as well (see Cinematic Mod for great character models and textures).
I just think that Source has been and still is the engine that trumps all competition to be honest. I do also like CryEngine but I'd like to see it used in other game types, from other developers. I'd like to see how a real sandbox-style game would end up like under CryEngine (bigger landscapes, less loading, more assets on-screen, great physics, etc.). I would probably shit some bricks if Fallout 4 was made on CryEngine.