Photons to Photos published its Sony Alpha 1 results, which you can manipulate here. It looks like the Sony A1 splits the difference in performance between the Sony a7RIV and Sony a9II with the Sony a7RIV excelling around base ISO and the a9 performing the best above 800 ISO.
| Camera Model | Maximum PDR |
Low Light ISO |
Low Light EV |
|---|---|---|---|
| Sony Alpha 1 | 11.36 | 5215 | 10.70 |
| Sony a7RIV | 11.62 | 4744 | 10.57 |
| Sony a9II | 10.90 | 5709 | 10.84 |
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Sony A1: B&H Photo / Amazon / Moment / Adorama
Sony a7RIV: B&H Photo / Amazon / Adorama
Sony a9II: B&H Photo / Amazon / Adorama