Marioxb, if you think an older film shouldn't look as good as a new one, rent or borrow any of these dvd's and ask yourself how they can look like they were shot yesterday.
The Adventures of Robin Hood (1937) that's a whole 40 years before Star Wars was released
Gone With the Wind (1939) either the newer 4 disc or 2 disc editions
Willy Wonka and the Chocolate Factory (1971) saw this over 10 years ago in school on vhs, looked pretty bad.
Monty Python and the Holy Grail (1974) this was the first dvd I got and I couldn't believe how much better it looked than a vhs rental.
Dragonslayer (1981) there's plenty of matte lines here so focus on the non special effects shots
E. T. The Extra Terrestrial (1982) avoid the '05 single disc release and you will have both versions. How can they both look good?
Legend (1985) region 1 "ultimate edition" has two versions, both in high quality.
Back to the Future trilogy (1985, 89, 90) listen to the Q & A audio on film one near the end, it's asked if any visibly wires were erased.
These are what I would show someone if I had to convince them that dvd is better than vhs or laserdisc. And by the way "Star Wars" was shot in Anamorphic Scope 2.35:1 on 35mm film.