Image quality wise, 5D3 ML 3.5k and 5.7k AR 2.4 24p 14 bit lossless 14 bit color depth modes are no less than R1MX 4.5k ws RedCode 42 (42 MB/s) compression ratio 7.5 24p.
For rendering time in Davinci Resolve 18, R3D is about 3 times faster than ML raw 4k, more so than ML raw 5.7k.
Now lens is the bottle neck, instead of camera. Don't blame your camera, blame your techniques.
I suspect that once 7D2 and 5D4 have ML raw ported, they may be at least equivalent to BMPCC 6K/pro, Red Dragon 6k, or even Alexa 35 (maybe dr not so).
ML Rocks!