I don't see any equipment issues. Save the UHH blame the equipment approach for someone else's time waste. See the comment above about this lens not being a landscape tool. When I compared the front of the boat, even with the AF points removed by Adobe, I see a valid point of comparison.

Basics of noise processing

Basics of Lightroom Sharpening

Beyond the ideas above for Lightroom, consider pulling your RAW originals into the Sony software and make another assessment of the 200-600 to the 70-200 at the AF points of both images.

I would review the review sites and find people speaking to the 200-600 lens performance at specific apertures and specific focal lengths. Is wide-open at any focal length the best option for this lens?

When I download the uncropped 200-600 attachment and open that in the Sony Imaging Edge viewer, even the converted JPEG looks better than the posted attachment. That would indicate there's opportunities for more sharpening and contrast in your editing approach in LR.

So, you may need to practice and consider 'how' best to use the 200-600, both in your exposure technique and your post processing. Comparing it 1 to 1 to a higher quality lens such as the 70-200 may show some of the limitations of the longer and cheaper zoom. But again, I think your usage and editing approach can narrow the gap.