A comparison if one product is useless. I guess the point was people will believe the man with the microphone.
What would be better would be to have say the windows 7 beta running in a booth with an enthusiastic person displaying one UI, and another both with KDE.
Tell the people that they have a vote in UI, and allow them to voice their opinions after seeing both.
PS. I went back to gnome after a week of KDE 4.1..