Image Resolution

[Happy_Evil_Dude]

I don't really have the time to get into a lenghty answer but let me just say this:

As you put it, "it has nothing to do". Older movies can look absolutely stunning on Blu-Ray (see Casablanca) while newer movies can look, well, not that great (see House Of Flying Daggers). So it doesn't have anything to do with how old a movie is, but the quality of the source master and the work done by the company in charge of making the Blu-Ray.

As for 1080p camcorders, yeah they exist, but movies aren't typically shot with them. Actually movies are most often shot with cameras that have a higher native resolution than 1080p.