So many different settings can influence how two scenes using the same vegetation can have both a unique look and feel. In comparison to my Field image one of the main differences is sun position. I placed the sun quite a bit higher in the sky then Franck has here which gave the bright reflections off the grass blades.
I can't say whether or not the raw images would look similar or not, but I would guess not. I generally never bother with adjusting the contrast or the gamma in the renderer as I work with the .exr output, so in most cases the image is very flat and ugly until I get it into post.
As to Franck's image, it is brilliant!