Well done YiFeng & Ricardo_C - hopefully this will further help demonstrate the huge difference between seeing native hi-def sources compared to standard def sources that have simply been scaled up to hi-def.
Obviously, the differences are even greater should someone have an actual 1920x1080 display that accepts a 1080p input, but even with a 1280x720 display, the differences should still be quite apparent between scaled SD and native HD.
As a strong proponent and advocate of 4K video I certainly share your enthusiasm, and is yet another solid reason why forward thinking Blu-ray is a far better choice than HD DVD which is seriously hampered by using very old disc structure technology.
More advanced higher capacity devices, like Blu-ray, will be capable of storing a few hours of 4K video - the problem though will still be how to properly output the signal, which remains a critical issue.
Regardless, this is an excellent thread and very good information throughout.
Descriptions like this always remind me of high-end audio...in a good way. Going from 8-track or cassette to CD was a noticable leap for most...but the upgrade to SACD or DVDA, while more subtle...changes music from a "digital recording" to a "live event" in ways that really resonate with an audiophile listener.
Those small differences can have a large emotional pay-off with movies and music.
p.s. that Narnia comparison is breathtaking. Where did that 1080P source come from?