Here's a 100% crop into the area around the bird feeders:
Shot Canon RAW with an EOS 5D MII, Quality "RAW" 21M 5616x3744 pixels.
In post-processing (Adobe Lightroom cc 2015.7) I applied Highlights -70, Shadows +88, Blacks -79.
In Detail I applied Sharpening, Amount 50, Noise Reduction - Luminance 60 -- which I do to virtually every photo I've shot (and I shoot tens of thousands of photos with my 5D M2 or my 1D M4 each year).
The image was cropped to 4088x3270 pixels in an 8:10 aspect ratio.
Period. That's it.
And yet this is unacceptable because of "Grain/noise"?