Beisdes the change in lines, I couldn't ever see any surface details on the 6ft, when it broadcast, I could with the 4 ft. Of course again the lines, not just surface details is changed on that.
But with a larger screen and high screen resolution (or when looking at detailed photos), you can see the detail that is on the six footer.
Now I do have preference for what was broadcast with the 4ft, for two reasons. One that I could see detail, and 2nd that it was such an easier model to film, the amount of shots we got went up dramatically.
Of course, I am a little scared to see what the 4 ft looks like with a large screen in HD.