This A900 ISO 1600 RAW shot is taken with the 500mm RF mirror lens (f8) which is notoriously difficult for depth of field. Reducing the output using ACR to 6.3 megapixels creates a better impression. No luminance NR has been used here at all, and high sharpening has been used, so the grainy noise is really emphasised not reduced. Chroma NR has been set to 50.