No picture, no talk. And the perception of 'grainy' can be very different between people. Also: I do hope you are not zooming into the shot above 100%? Are you checking the picture in a RAW converter or just an some funky image viewer? If you use a picture viewer please take note that the image you see is NOT the RAW file, but a quickly processed, scaled down and embedded jpg image. So make sure you look at the RAW file when assessing the results.
Use a RAW processor, use standard settings, create a full sized jpg, leave the exif data intact and upload to any image / file sharing host you like. Then share the link here.