UE 4.6, completely dynamic-only lighting, all static and/or baked lighting disabled, distance-field stuff disabled, SSAO disabled, the directional light is still called stationary but is actually set to movable.
To see the issue and current (mostly default) shadow settings, right-click the image and select open-in-new-tab:
https://dl.dropboxusercontent.com/u/136375/img/screens/unreal05.png
How do I tweak which of those settings to lose the jaggies and get smooth shadows? Tried everything, shorter and longer distances, 4 cascades, you name it…