Some casual "tests". Here a comparison at FL = 50mm with my gold standard, the Zeiss Milvus 50/2. Same aperture (2.

, same speed (1/250s), same ISO (100), same place and time of course. The lighting conditions were variable though, and the lens change was not instantaneous. Zfc with Auto-WB. JPGs delivered by the camera.
The Nikkor pic is cooler (the Zeiss lenses tend to look warm: the 135/2 too, and the previous, non-Milvus, 50/2 MP was disturbingly warm),
slightly darker (as we will see, the light transmission is slightly less than the Zeiss').
Although the vignetting was corrected in-camera, the corners are darker. The Zeiss is already down one stop and does not show significant vignetting.
The background of the Nikkor shot looks more blurry (see upper left), but it can be either due to worse edge sharpness, or field curvature, or different blur characteristics (focus is somewhere near the middle of the central leaves), or any combination thereof.
But the Nikkor pic is quite acceptable. Or, in plain words, both are equally lousy.