I had gotten some rejections for "grain", and sometimes, I can see it, others I really don't, but have taken to shifting my workflow to first:
open the image RAW file in Sony's Image Data Converter SR ver 2. There, I can set the exposure if necessary, and use the "noise reduction" feature on "auto" It despeckles very nicely when I have taken low-light photos (nonaviation), and now do this routinely. I also use this program for color balance.
I then save as a jpg, and continue other edits (sharpening, level) in photoshop. I was wondering about others' experiences with noise reduction with vendor-provided products, like Sony's. I found that noise reduction in Photoshop results in soft photos, and sharpening after that is less than satisfactory. Maybe it's just me though.