The problem is that the contrast in the highlights has been compressed and they now appear somewhat flat. You can see that the specular highlights (which should have a noticeable edge) have merged with the surrounding highlights. Have a look also at the Stormtrooper's helmet, the bubble window below Threepio's shoulder, and the threading on his neck for further examples of loss of highlight detail. With selective channel replacement those specular highlights can be even better defined. Not trying to piss on anyone's work here, just pointing out something that stood out to me. The rest of it looks phenomenal.
Raw Blu-ray (top), Raw adjusted (middle), DE v2.1 (bottom)