Like i said i got my scene running a gtx 980… the first dx12 card available. And yes it uses lumen and virtual shadow maps.
I think your forgetting the added benefit of nanite of not really having to worry about draw calls anymore… not to mention the extremely cheap vertex shader allowing you to do crazy stuff in your materials for faster .
Perhaps your not adjusting lumen settings and just running it all on high quality. It looks the same at lower quality settings.