Owen, thanks for the input and clarify things a lot! I watched them mostly in JB where I guess they use blue-ray source but component input to feed all TVs. So you might be right that they were using 60HZ so judder could be very noticeable. However all plasma / LED /LCD TVs were taking the same signals and fine but the D8000 Sammy stood out to be the worst offender. Lack of smooth motion process for high end plasma like this is disappointing. On the bright side, I only use blue-ray HDMI source so I guess it is not a issue to me. But I need to find a place with 24HZ blue-ray on demo.
Free to air TV hopefully as you said should be OK but again I need to find a place with TV show for demo. After this motion blur shock, I find it hard to trust anything on review or theory but my own eyes.
Finally got the chance to demo the D8000 with blu-ray source. I was hoping D8000's motion smooth feature will automatically turn on under 24hz mode so the judder issue will be gone. The sales guy managed to find the Top gun blu-ray with the rolling credit in the end. Not 100% sure the replay mode at the time but the screen showed 24p so I assume it is the 24hz mode. Guess what, the credit still has obvious judder. A 100HZ samsung D6400 LED next to it playing same source, smooth enough.
Am I the only person noticing this? probably not. Professional reviews are mixed. The whathifi one did mention its motion handling issue.
It stated - "Finally, motion, isn’t quite as solid or smooth as that offered by rivals."