I've been working on this short R&D film as a personal exercise to learn the workflow of UE4.
I was concentrating on looking at realistic lighting, cinematic cameras and rendering.

While the depth of field is really nice in the engine, I found it a more versatile workflow to output a z-depth channel from UE and add/control the DoF in post (After Effects) - so I could adjust/pull focus without having to re-render.