DP Review have stopped publishing curve information and now use test shots only. The curves can show what is going on more clearly.
I’d guess that they have stopped due to certain manufacturers complaining. The curves show what they manage to stuff into a jpg - usually all of the information that is usable in a raw file and some. Nikon have been some way ahead of Canon at the dark end for a long time. The 80D was the first attempt to catch up. I’d say that in terms of truly usable dynamic range there probably isn’t much difference if any now.
John