Quite an interesting comparison indeed.
I am always a bit puzzled by those youtube reviews though. In many cases, I can hear significant differences on my PC using middle-range Audio Technica or Sennheiser headphones. Now, there are youtube demos that are clearly manipulative, let's forget about those. But here, unless I there are biases and tricks I am not aware of, it seems they put some real effort into controlling the conditions.
After going back and forth in the video for a while yesterday and today (I wish they would put markers on music start, I lost a bit of time taking time stamps), my personal rating would be 1) Grimm 2) D&D 3) ATC (that one markedly not as good as the others imho). That's highly subjective ofc.
But what bugs me is that I am able to hear clear differences in what are supposed to be 3 very good speakers on a reproduction system that should be the clear limiting factor. The D&D bass sounds strikingly different than the ATC one imho. One seems hyper tight, the other a bit mushy...
I feel I hear a much bigger difference between the Grimms and the ATC in a youtube video than between my own Focal and Giya in my own home, at the sweet spot. Again, that's a bit disturbing tbh as I am intellectually challenged by the idea that the limiting factor (PC + headphones) should equalize things. (yeah, I know I am rambling here)
I could be satisfied, since my own prior bias, which is that FR doesn't tell the whole speaker story by far, seems to be confirmed in this case but, instead, I remain puzzled.
I guess one could say that the Grimm just interacted better with that particular room...
Note: I spent a bit of time going back and forth but did not download the soundtrack to check levels.
Edit: I've only heard the D&D in real life and the video did not totally match my live impression.