True but not really relevant.
In the previous version of FCP when DVCPro HD was scaled to 100% in a D1 sequence, I had 234 more pixels vertically ( 720-486). Now in FCP I have 720 filling a 486 space and any enlargement of the image through scale degrades the picture.
Import the same footage into AE and put it in a D1 sequence at 67% scale & I’ve filled the frame. So the resolution is there in the material, but FCP is treating it oddly and diminishing the quality considerably.