(This page compares the widescreen Scimitar tape to a full-screen version taped off of TNT.)
Yowza! In this scene you can see both astronauts in the widescreen version, but only one in the full-screen.
This would be a good place to talk about ratios. A TV screen has a ratio of height to width of 1.33:1, so the screen is somewhat longer than it is tall. But a movie screen is much more retangular. In the case of this film, filmed in Toho-scope or something, the image is actually about 2.35:1, so the image is more than twice as wide as it is long. That's why the full-screen version cuts so much off of both sides of the image.
Some of the later Godzilla movies, from Godzilla vs Biollante on, were shot at a somewhat milder aspect ratio than the ones made in the sixties and seventies.
No question which version of this movie you want to see. Widescreen all the way. What little you lose in detail, you more than make up for in terms of the information gained on the sides of the screen.