Richard Johnson

Arrow 4K Blu-ray is is a bit stronger than the very good Blue Underground The differences in the body of the film are negligible, but Arrow does have all three main credit sequences (Zombi 2, Zombie Flesh Eaters, and Zombie) that play in 4K via seamless branching. They also un-stabilized the handheld shot in the Zombie closing credits that Blue Underground had stabilized when they added new digital titles. It's back to looking properly handheld.

Arrow 4K Blu-ray > Blue Underground 4K Blu-ray, "has the original Italy mono - think someone said earlier that the Blue Underground was a downmix on that track and the Arrow is corrected"