If one looks close enough, all sensors have noise at all ISOs regardless of the comments by the fan boys. When someone doesn't see noise until above ISO 6400, they are just looking at very small images from a distance, perhaps on a low resolution monitor. View at 100% on a 4k monitor, up close, and the noise will be visible.
There is no magic here, Capture One vs Lightroom is just a matter of your choice of settings and adjustments. Noise is inherent in the sensor technology and not Bayer vs X-Trans. Because of the arrangement of the color filters on the pixels, color (not luminance) noi