http://www.zonadvd.com/modules.php?name=Sections&op=viewarticle&artid=707
Click the link,
a good picture based comparison of the quality difference between SD and HD (DVD vs HD-DVD / BR).
To me it looks brilliantly different, like a whole new world. Hair and skin are the main details I notice on first glance.
But honestly, will it REALLY make THAT large of a difference to the average consumer?