In SDR, highlights refers to things like the white fabric of a wedding dress or a lace doily where detail is still present, while in HDR, it refers to specular highlights and light sources typically exceeding 203 nits. There is no highlight roll off in HDR as there is in SDR, and while it can occasionally be used to powerful effect, clipping is usually revolting and best avoided. You can judge for yourself how well the Komodo handles highlights by examining the featured image at the top of this post.
And here’s some R3D sample footage (6K 17:9 40fps LQ) you can download and drag and drop on the timeline of the NLE of your choice. If you’re new to the R3D post workflow, head on over here and scroll down to the bottom of the page for some pointers.