About the chroma smoothing issue, my only problem with the XT4, was that at a certain distance, on a face, the teeth and the white of the eyes tend to take the color of the skin, as Attila Bakos showed on his example with the red bricks joint. With the XH2S in ProRes HQ, it looks much better. And the Flog2 is absolutely amazing. Currently Flog2 isn't in Resolve so I'm using a CST with Gamut : REC 2020 and Gamma : ArriLogC (because the gamma curve of ArriLog C and Flog2 is almost identical, but not the color space)
I had tried to tinker with a node in Resolve that acts only on the red channel to fix the chroma smoothing issue but no really interesting result.