DAZ Studio uses Catmull-Clark subdivision, Poser does not. Genesis seems to rely heavily on that, if the image above is right. This would not nessesarily mean that a Genesis for Poser would have to look bad, they would just need to publish a version with more polys, but seemingly the exporter does not do that (yet?). 

A ship in port is safe; but that is not what ships are built for.
Sail out to sea and do new things.
-"Amazing Grace" Hopper

Avatar image of me done by Chidori.