I also shoot in progressive mode on my VX2100 because I like to grab crystal clear video grabs (which look nothing like video grabs). I was wondering the same thing with that HD camera since I expect to get both videos and pics out of the same shoot. I've seen some of the video grabs from that Sony HD, and while they look way better then other interlaced grabs they still look like a video grab. Doesn't have the still photo quailty that taking stills from 740p has. I don't have a link to those HD grabs. Sorry. I'm sure I probably found them through google.
To get my stills from the progressive video I first run the DV-AVI through Thumbnailer v5. No resize, and grabbing every 3rd frame. Then I go through the folder and quickly grab the good ones. Then do resizing (from the native DV 740x480 to the correct aspect ratio of 640x480), levels, and touchups in Photoshop CS.
Here's some video grabs from my VX2100:
