Poncho, I’m having the same problem, Path Tracer looks great in viewport render but when i use the movie renderer it comes out low detail and blurry looking, even if I set anti-aliasing to 32/32 or 256/256 takes forever but same result.
However if i go into path tracer settings in the movie render que and check Disable Multisample Effects the render works correctly but now i lose my depth of field from camera. But if i render in viewport render looks great with depth of field.
Can someone help with this, Poncho, did you figure this out yet?
My scene is in 5.2 but also tested it in 5.3 with same issue.
Thanks