[X-E2, XF18-55mmF2.8-4 R LM OIS, Mode = Aperture Priority, ISO 6400, 2.3, ƒ/8, (35mm = 73)]

This post compares the two cameras with just the light from a Christmas tree in the room.  Custom white balance using the ExpoDisc with both cameras.

Downloadable high-resolution file links are below some photos so you can compare them at 100%.

Here is the setup

Comparison of ISO 6400 ƒ/4 and ƒ/5

[Figure 1] Fuji X E2, ISO 6400, ƒ/4, 1/7

Crop of Figure 1

[Figure 2] Nikon D4, ISO 6400, ƒ/4, 1/2.5 28-300mm

Crop of Figure 2

6400 @ ƒ/8

[Figure 3] Fuji X E2, ISO 6400, ƒ/8, 2.3 [high resolution file]

[Figure 4] Nikon D4, ISO 6400, ƒ/8, 1/1.2, 28-300mm [high resolution file]

ISO 12800 @ ƒ/8

[Figure 5] Fuji X E2, ISO 12800, ƒ/8, 1.0 [high resolution file]

[Figure 6] Nikon D4, ISO 12800, ƒ/8, 1/3, 28-300mm [high-resolution file]

ISO 25600 @ ƒ/8

[Figure 7] Fuji X E2, ISO 25600, ƒ/8, 1/2 [high resolution file]

[Figure 8] Nikon D4, ISO 25600, ƒ/8, 1/4, 28-300mm [high-resolution file]

Conclusion

They are different camera chips.  The one on the left is traditional, and the one on the right is in the Fuji X E2.

You have a different look and do not like comparing similar chip designs.

I think the Fuji X E2 rocks, and the main reason I wanted it was to be able to take photos in low light when I didn’t want to carry the Nikon D4.  I think it works just fine.

I do not think the Fuji will replace the Nikon D4, especially in shooting sports, but it can replace many situations I am working.