That wasn't magnification, that was viewing 1:1. You can click on Comp button and see similar results, slightly imroved for 5Ds because of downscaling.
I don't see shadows in 5DIV any brighter tbh. Moreover, to me it feels like 5Ds image is actually a bit brighter than 5DIV on DPR, same in your sample.
It is sharper, but if you apply any noise reduction (LNR) you'll loose a lot of detail.
What actually disappoints me though is this modified comparison with 90D
https://www.dpreview.com/reviews/im...t=1&x=0.8574631217392756&y=0.2192025092867554
Again at 1:1 90D also produces messy shadows, worse than 5DIV. If this is what new-gen Canon sensors are capable of, I'm concerned. They still haven't caught up with Nikon D810 from 2014.