Clarity, sharpness, depth of color (or richness of grayscale for B&W films). Those four films I mentioned above certainly have those qualities.
An average older film? Well, if the film is properly mastered in high definition, yes, it should look noticeably more appealing.
I can tell you my first Blu-ray experience was THE SEARCHERS, and even the CREDITS knocked me out they were so super sharp. Often, the clarity is such that your eye is fooled that it's watching 3-D. (Of course, Vistavision is known for its uber-sharp picture.)
An average older film? Well, if the film is properly mastered in high definition, yes, it should look noticeably more appealing.
I can tell you my first Blu-ray experience was THE SEARCHERS, and even the CREDITS knocked me out they were so super sharp. Often, the clarity is such that your eye is fooled that it's watching 3-D. (Of course, Vistavision is known for its uber-sharp picture.)