This is the best rendition of grapes I've ever seen reproduced in a 3D render. Absolutely nothing about this gives it away as CG. It's a perfectly photorealistic render. WOW. Brilliant in so many ways.
Going through your gallery after seeing your marshes work
I like this one too. The reflections of the grapes are spot on. I really like the 'smudgy' waxy parts on the grapes, very lifelike. With (a bit more) SSS it may even look totally real. Perhaps the renderer you're testing doesn't support it? I suppose you can't disclose its name