As for the accuracy of the renders, I missed the earlier discussion...
That probably got a little out of hand, but I do agree with one of the early observations - your render appears darker, more gray and less green than the color specification would indicate, the modifiers actually look dark grey, almost charcoal on my screen (which is a TV, 4:2:2 color depth only and not calibrated i.e. pretty bad for comparison like this.)
I did a screen grab of the various images next to each other. Only because I wanted to try it out, the bottom middle with random characters is Solarized Dark in gedit:
I'm hoping the manufactured article tends toward the greener and lighter overall, but I can't obsess about the variations between the different renders and the physical for the reasons already pointed out: GMK color will not match exactly, lighting, color temperature and physical texture will have a very significant effect on the perception. However, while we are looking at the renders, is there a color space issue that might be amplifying the difference on some screens?
EDIT: and as I perceive them, GMK renders tend to look a bit pale and washed out.