sRGB covers the entire gamut of K25 and KDC images, so if you have not extensively post processed the image (e.g., increased color saturation) there’s no loss of color information, and sRGB images have the best chance of displaying correctly on non-color managed systems. If you have extensively post-processed the image in kxxMagic, you should select the TIFF export option rather than JPEG. The TIFF option uses the ProPhoto color space.