I also played with the 950XL in-store vs. my 1020, and found a very similar result to the original images in this post.
1020 color was not as rich, but detail was better. Of course, in that situation there is the issue of the resolution difference, but what bugged me about the 950XL in my comparison that I also see in the original post here is the artifacts, and the noise/blur at the edges of objects, especially distant objects such as the girl playing guitar, or the shoulders of the guy in the blue shirt. The orange "The new office is here" signs on the table are clearly more legible in the s6 photo, too. I really want the 950 to have better detail and sharpness with its current colors, which I like.
That being said, the 950 demo units are running prototype software. I'm really hoping these flaws are due to the pre-production software, and that the finished units will provide shots more like those above. Those are incredible even vs. the 1020.