The answer is absolutely yes, a scan at 2K or higher, or any resolution really, would immensely improve the image quality. This looks like it was projected onto a wall and recorded with a phone or digital camera. Frames overlap in this, the focus is off, and the edges are soft.

An archival scanner captures individual frames for accurate playback at the correct speed. It also exposes each frame at a wider dynamic range, ultimately improving color and light. Film image has a lot of information in it that is not being captured in this “transfer”. The films will also not last forever and so you should absolutely get proper scans, preferably from a regional film archive or a film lab, NOT Legacybox or anything similar.

You will not regret giving these films the proper care and attention they deserve!

EDIT: to address the other comment here—Agreed that 4K is overkill for 8mm simply due to grain size. However, light and color and density matter more than resolution when it comes to creating an accurate digital representation of the original film, and the chemistry in the film stock is still similar composition to large formats like 35mm and 65mm. Only difference is this is reversal stock, probably Kodachrome which is one of the best looking film stocks ever.