Just realized this topic title isn't specific enough.
KZ:SF multiplayer is rendered at 1080i 60fps which is essentially 1080p 30 fps but rendering half the frame in half the time.
KZ:SF multiplayer is output at 1080p 60fps because of the interlacing. Thus the PS4 is doing no upscale, which is why the pixel density per frame is 1920x1080.
Thus the Resolution (display output) is 1080p 60 fps.
For the multiplayer: Framerate > Resolution as is the case for most fps, they increased the framerate at a tradeoff of fidelity, but not Resolution.
In fact, using this method, Titanfall could easily run 1080p 60fps locked with a minimal hit on fidelity if they do it right, but I don't know if the source engine supports interlacing.
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