How maximizie quality?

What options do I have to crank up DOF quality? And quality in general? Target is as close as possible to Corona for example (but with Unreals raytracing possibilities).
Currently using CineCameraActor and am curious how “good” stills that can be outputted from Unreal 4.24. My example uses only real time raytracing. No Lightbaking,

Highres screenshot:

What I expect more or is less jitter in DOF I guess?

Windows 10
RTX 2080ti
Unreal Engine 4.24.1