I think you missed the frame rates in your list. What’s the maximum of the fx9? 4K60p?
As a former FS7 owner I can tell you that the handicap of the C300ii was the lack of 4k60p and the initial price point. FS7 vs C300ii was a difference of 8,000€ if I remember right.
It's worse than that. Right now the FX9 only does 4K 60 on a super 35 sensor crop. They're promising to use more of the sensor for 83% off FF 4K 60 with future firmware.
Source: https://pro.sony/en_GB/products/hand...orders/pxw-fx9