I would have clicked sooner if I knew there were these many images :- ). A lot more cool than I expected. Nice work ! Fun to watch :- )
When I think of CGI lemons, I always think of that SpecularNormals research paper which has shown how the proper surface can't be captured by neither photogrammetry nor pure diffuse albedo photometric stereo.
Only once they combined (which to my naked eye looked almost like 50:50) the albedo and specular normals, both from photometric stereo it looked correct. By then, the surface was heavily 'dented' which would be smoothed by SSS.
Watching your video, you in fact did all this :- ) In your own way (since I presume you overlayed generic noise, or highpassed noise from albedo scan?).
It's very close imho and I am not sure if it's the normals, or the SSS that betrays. I find Corona's SSS to be hard to tweak for weak/shallow effect.
I might try stronger displaced surface (from the denser noise that emulates specular normals) where the SSS could work stronger as well. Sorta like that snow shader from the Arnold tut around.
Anyway, don't mind my rambling, it's pleasurable work to see this :- )