I like the colors and overall image of this camera, especially for the low price, but Nikon definitely sacrificed DR for a faster readout. This is from G. Undone's test:
10.9 usable stops in 6K R3D NE is not great for a modern cinema camera. NR will get you another stop, but it's not an ideal starting point. By comparison, the Komodo 6K scored 12.5 usable stops in 6K R3D and the Komodo-X was at 12.9 when tested by CineD.
CVP's latitude test was also fairly extensive as it tested both native ISOs:
The good news is that you don't lose much DR when switching into the higher base. The bad news is that, no matter which base you use, most of its competitors have an extra stop in the highlights:
As for under exposure, it is usable to under 3, but no more. It is RAW after all, so this poor result is understandable when compared with the Sony cameras.