Tomorrow, Nikon will officially announce the new Nikon Z6, Nikon Z7 full frame mirrorless cameras to compete current Sony a7 III and a7R III. Here is the specs comparison of Sony a7 III & a7R III Vs. Nikon Z6 & Z7:
Famous Photographer Max Yuryev has made a video for high ISO lowlight comparison on Sony a7 III (Amazon/B&H/Adorama) with a7R III (Amazon/B&H/Adorama), a6500 and Panasonic GH5. From the result, we can clearly see that a7 III has best high ISO performance than all other three cameras. It seems that a7 III does have a next-generation sensor.