The Nutcracker and The Four Realms has a consistently good level of blur in its backgrounds, with decent blurriness occupying action and character beats in the foreground.
With 3D films, the blur factor usually signals how good of a job the conversion / filming team did with their 3D presentation.
You’ll notice the blur at any moment you decide to take the glasses off during a third dimensionally enhanced film.
But at various parts throughout the finished product, there are moments of 2D clarity that seem to exceed the standard visual anchor points that help the 3D moments pop off the screen.