How does this compare to the 4k ?
Color wise? Better.
Audio wise? Better.
Definition? Worst of course; still some shots have bigger frame size.
You should make an entirely new project but make it a BD50 instead of a BD25. With the source video from the 4K disc, audio from the ARROW BD and Universal Signature LD, and uncensored commentary from the Universal LD and/or early DVDs.