Foolz said:

GG, is that a lighting or platform comparison?

It's the engine running on PC compared to it runnning on PS4.

Steely said:

People can downport an UE4 game to anything, it's just that it might not be worth the time, money and effort for most devs considering the compromises the developer would have to made in order to get a working port out of it. Eventually, you're going to wish you had stuck with UE3 anyway. Because of that reason, there's no interest from Epic in offering support for that, as they seem to be focusing on next gen consoles and PC for UE4.

In this case, it was always their intention to be on a wide variety of platforms including mobile:

" We’ll run on mobile phones and on a wide variety of things"

The new engines are all about scalability, that's why most of the next gen engines also work on current gen platforms. If it was always their intention to make UE4 work on mobiles/cell phones then you can't then logically say that Wii U is outside the spec of the engine and not worth it.

Like I said, Epic's attitude is that they won't even update and refine UE3 for the Wii U. What's the excuse there?

Foolz said:

But they've got totally different lighting. Or rather, one has lighting, and the other doesn't. Was that the point? It seems a bizarre comparison.

You'd have to ask Epic. It seems that the PS4 version has no enviromental effects or depth of field enabled but also some asshat textures in use too. That was from the first PS4 reveal. They could have run into some problems adapting it or just have been time constrained.

Okay this is stupid, on Epics UE4 Website they describe the benefits of the engine:

Epic said:

The most world-class game engine to date, Unreal Engine 4 gives you the power to do more than ever before. Bring your creative visions to life directly in game without programmer assistance via the new Unreal Kismet. Unreal Engine 4’s architecture offers fully dynamic lighting features, cutting down on development time and ensuring less iteration on creative ideas. With significant new visual features, Unreal Engine 4 enables you to achieve high-end visuals, while remaining both scalable and accessible to make games for low-spec PCs..

So again Rein has contradicted himself.

No it's not, that's the stated goal of the engine, it's all about scalability - everyone is doing it with their next gen engines.