Final answer:
Macduff is utterly horrified and emotionally distressed upon finding King Duncan's murdered body, whereas Macbeth and Lady Macbeth exhibit differing degrees of feigned ignorance and guilt, respectively. Macbeth's reaction includes hallucinations as a sign of his troubled conscience, while Lady Macbeth initially tries to manage the situation before her own guilt becomes apparent.
Step-by-step explanation:
In Macbeth by William Shakespeare, the reactions of Macduff and the Macbeths to King Duncan's murder contrast sharply. Macduff is horrified and incurs a great deal of emotional distress upon discovering Duncan's body, expressing this in a passionate outcry, "Confusion now hath made his masterpiece! Most sacrilegious murder hath broke ope The Lord's anointed temple". Macduff's language suggests his utter shock and the profound sacrilege of the regicide, portraying it as an unparalleled disaster.
In contrast, Macbeth's reaction is more contained and characterized by feigned ignorance and supposedly spontaneous wrath against the supposed murderers which is actually an attempt to cover up his own guilt. Notably, after the murder, Macbeth's guilt manifests in hallucinations, expressing that he will no longer be able to sleep, "Methought I heard a voice cry 'Sleep no more! Macbeth does murder sleep'". Lady Macbeth, on the other hand, initially tries to control the situation, but her façade of being untroubled soon crumbles, revealing her underlying anxiety and exposure to guilt as she scolds Macbeth for bringing the daggers with him, "A foolish thought, to say a sorry sight".