Lumen in the Land of Nanite PS5 Demo being run on PC.
The entire demo consisted of 6.14 GB of Nanite data.

Brian Karis - "Quick note: last year's demo content I showed in the editor was not PIE so does not have the same lighting which is activated by blueprints to hand tune sun light for different areas. So the lighting surely didn't look as nice as the original. Same goes for missing interactive elements, VFX, etc that get triggered through gameplay scripting. Also I was in 1080p for video streaming from my WFH machine which doesn't have a capture card. UE5 has gotten *substantially* better since we showed this demo. No "downgrades"."

https://twitter.com/BrianKaris/status/1400555472034275328