Not sure the point of downscaling 4K77 to 720p… not exactly a fair comparison.
This is a 4K83 comparison, but upscaling Despecialized to 4K works too – but it’s still not a fair comparison.
Left is Despecialized, right is 4K83.
Projection prints simply have less fine detail than negatives and interpositives, no matter what resolution you scan them at.