Look at the giant sample image of 100MP captured at ISO 12800. As expected the Phase one camera with a price tag of $50K giving out excellent output, at the same time Sony A7R II and Nikon D810 image samples are also visible in front of Phase one. But Nikon D5 and Canon 1DX Mark II showing weak output due to less resolution.
Also look at Sony A7R II High ISO Test image and also look at Sony A7RII showing more details compared to Nikon D810 at High ISO Test – Best Lenses for Sony A7R II