In 13 x 19 print, it looks excellent. In 16 x 20 it looks very good. As I've noticed in some other images from this camera, the noise can look peculiarly defined and tight, which in the 16 x 20 calls some attention to it. By contrast, the M8 noise is softer edged, blurrier. I have no idea what this is about. I upsized the 16 x 20 image in Alien Skin Blow Up with their default 100% sharpening, which they say only compensates for the increase in size and which I have found to be true with other images. Perhaps it slightly oversharpened this image.
Also, notice in the 13 x 19 100% crop that there are peculiar artifacts, JPEG like, and that they are gone in the 16 x 20. I don't know what to make of either of these issues. In the 13 x 19, do you think it might be the chroma NR or oversharpening in PS? As I said, the 13 x 19 print looks excellent and I can see none of this JPEG-like stuff in it. The 16 x 20 doesn't show that either, but shows the "sharp" noise when looking closely.