See my Sigma mirrorless wish list.
I take a look at the Sigma sd Quattro H on intensely saturated reds, the same subject shot with the Hasselblad X1D and Nikon D810 a few days ago.
Image at sizes up to full 25.5 megapixel resolution, with RawDigger histogram and Sigma Photo Pro settings.
There is only one acceptable Color Mode in Sigma Photo Pro for this shot.
Viewing this image on a display with less than the full AdobeRGB color gamut will not reveal the ideas discussed above—the reds will be flattened. Use a wide gamut display.