Jim Kasson is thoroughly testing the A9II. Here are the links to his different tests. One special mention goes to the Sony a9II “star-eating” test (Jim Kasson):
The Sony “star-eater” digital signal processing doesn’t start until the shutter speed is 20 seconds or longer, which is quite an improvement over the a7RIV.
Sony a9II EDR (Jim Kasson).
Sony a9II dark-field spectra (Jim Kasson).
Sony a9II fixed-pattern read noise — short exposures (Jim Kasson)
Sony a9II fixed-pattern read noise — long exposures (Jim Kasson).
Sony a9II precision (Jim Kasson).