DxO published the full Sony A7rIV tests results. The camera scores about the same as the A7rIII:
Despite the challenges posed by the increase in pixel count, Sony’s latest addition to the high-resolution A7R series, the A7R IV, continues to deliver excellent dynamic range, particularly at low ISOs, while also delivering very good color discrimination and control over noise. While the technological advances are impressive, it’s not quite enough to put the sensor’s performance ahead of rival, lower-pixel-count devices overall. However, the increase in pixel count to 61.2MP, making it the highest currently available in 35mm full-frame format, is certainly compelling. When you combine that with the upgraded AF and other refinements, such as its higher-res EVF, robust build, and improved ergonomics, the Sony A7R IV is one of the most—perhaps the most—capable and versatile high-res 35mm full-frame cameras available.
Sony A7rIV and new accessories:
Sony A7rIV in USA/CA at BHphoto, Adorama, FocusCamera, Amazon, Henrys.
Sony A7rIV in EU at Calumet DE, ParkUK, WexUK, Calumet NL.
Sony A7rIV in Asia at Sony Japan. Sony Australia.
Sony VG-C4EM grip in USA at BHphoto, Adorama, Amazon, FocusCamera, ParkUK, WexUK.
ECM-B1M Digital Audio Shotgun Microphone at BHphoto, Park UK.
XLR-K3M Mic at BHphoto, Park UK.