Well, I for one have never been impressed on a personal level with a Lexus interior. Not the 2012 LS, not the 2013 GS of which I recently drove around for a day.
My Mom has a newer ES, and I don't know whether the wood is real or fake on it, but it LOOKS fake, and cheap
IMO, most Japanese car interiors, even the higher quality ones, like the new GS's technically is, usually don't have that "weighted quality" of good German interiors. The buttons are usually chintzy, light (this goes for the current pre-facelift-facelift LS as well), the doors are light and have bland sounds when closing, as do the switches. There's an "airiness" to the looks and feels that lack that "granite" one I like from certain German cars.
Also, there's an intangible lack of "sexiness" to Lexus interiors. The shapes, the feels, the designs, just don't "turn me on" like a Mercedes or some BMW interiors will [No Robo], for example. This goes for the current LS, current ES, and new GS.
As for Bamboo, who the hell wants Bamboo shoots in their rides?