There is no harm in the Prophet doing that which Allah has ordained for him; such has been the course of Allah with respect to those who have gone before; and the command of Allah is a decree that is made absolute: Surah 33:38
He claimed other prophets before him had those privileges. In the area of marriage, Muhammad claimed he could have as many wives as he wanted.
O Prophet! surely We have made lawful to you your wives whom you have given their dowries, and those whom your right hand possesses out of those whom Allah has given to you as prisoners of war, and the daughters of your paternal uncles and the daughters of your paternal aunts, and the daughters of your maternal uncles and the daughters of your maternal aunts who fled with you; and a believing woman if she gave herself to the Prophet, if the Prophet desired to marry her-- specially for you, not for the (rest of) believers; We know what We have ordained for them concerning their wives and those whom their right hands possess in order that no blame may attach to you; and Allah is Forgiving, Merciful. You may put off whom you please of them, and you may take to you whom you please, and whom you desire of those whom you had separated provisionally; no blame attaches to you; this is most proper, so that their eyes may be cool and they may not grieve, and that they should be pleased, all of them with what you give them, and Allah knows what is in your hearts; and Allah is Knowing, Forbearing. Surah 33:50-51
Allah allowed Muhammad to basically have any woman he wanted and dispose of any woman he wanted. This rule was only for Muhammad, not for other believers.
The Koran also says that Muhammad was to receive special treatment when a person was in his presence.
O you who believe! do not enter the houses of the Prophet unless permission is given to you for a meal, not waiting for its cooking being finished-- but when you are invited, enter, and when you have taken the food, then disperse-- not seeking to listen to talk; surely this gives the Prophet trouble, but he forbears from you, and Allah does not forbear from the truth And when you ask of them (his wives) any goods, ask of them from behind a curtain; this is purer for your hearts and (for) their hearts; and it does not behove you that you should give trouble to the Messenger of Allah, nor that you should marry his wives after him ever; surely this is grievous in the sight of Allah. Surah 33:53
This says that a person could not:
- Enter Muhammad’s house unless he received permission to join him for a meal
- Enter while the food was being cooked
- Hang around and talk (chitchat), but just take their food and go
- Address Muhammad’s wives in person, but from behind a curtain (so that the person did not lust after them or they lust after the person)
- Annoy the prophet or give him trouble
- Marry any of Muhammad’s wives after he passes
Surely (as for) those who speak evil things of Allah and His Messenger, Allah has cursed them in this world and the here after, and He has prepared for them a chastisement bringing disgrace. Surah 33:57
One could not speak loudly in Muhammad’s presence.
O Ye who believe! Put not yourselves forward before Allah and His Messenger. but fear Allah. for Allah is He Who hears and knows all things. O ye who believe! Raise not your voices above the voice of the Prophet, nor speak aloud to him in talk, as ye may speak aloud to one another, lest your deeds become vain and ye perceive not. Those that lower their voices in the presence of Allah’s Messenger,- their hearts has Allah tested for piety: for them is Forgiveness and a great Reward. Those who shout out to thee from without the inner apartments - most of them lack understanding. Surah 49:1-4
Prophets in the Bible like Noah, Moses, Elijah, Elisha, Ezekiel, Joel all suffered relationally, physically and personally, struggling with spiritual matters. Theirs was not a life of convenience and privilege, but sacrifice. Many of the special privileges given to Muhammad were designed to make his life easier.