Engadget has tested the S1R and writes:
Is the S1R worth $3,700? If you had asked me this even a month or two ago, I would have said yes. However, Sony’s incredible new 61-megapixel A7R IV has put me in a tight spot here, based on the brief look we had. For $200 less, you get a lot more, including much higher resolution, phase-detect autofocus with incredible AI powered eye detection, and video features on par with the S1R.
Sony simply hasn’t given Panasonic an inch in performance, and has a proven track record with three previous A7R models. It’s a shame, because the S1R is a pretty incredible camera, but like Canon and Nikon, Panasonic is simply getting lapped by Sony in the mirrorless race.
Sony A7rIV and new accessories:
Sony A7rIV in USA/CA at BHphoto, Adorama, FocusCamera, Amazon, BuyDig, 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, BuyDig, ParkUK, WexUK.
ECM-B1M Digital Audio Shotgun Microphone at BHphoto, Adorama, Amazon, FocusCamera, BuyDig, Park UK.
XLR-K3M Mic at BHphoto, Adorama, Amazon, FocusCamera, BuyDig, Park UK.