Super 8 and 8 mm films have a few differences compared to modern videos. It is not only a matter of quality, because amateur footage recorded on film, be it:
If digitized with a professional telecine like mine, both in terms of acquisition and restoration, they can have a quality very close to high definition (perhaps even higher in the case of 16 mm) as I explain in this video:
The aspect ratio of the frame
99.9% of super 8 and 8 mm films were shot with 4/3 aspect ratio, the same that was used by TVs up to 10 years ago.
If you watch them today, you will see vertical black bands on the sides of the screen. There are several ways to adapt this format to modern monitors, which instead have a 16/9 aspect ratio. The best way is to preserve the original frame, thus maintaining the vertical black bands.
Other telecine services enlarge the picture by cutting off the top and the bottom of the frame. If someone digitizes the films this way, you will watch the video in full screen, but people will have their heads and feet cropped, not because the author of the film made a mistake while shooting, but simply because that type of adaptation made during the post production is wrong: