(http://islam.about.com/gi/dynamic/offsite.htm?zi=1/XJ/Ya&sdn=islam&cdn=religion&tm=21&f=20&tt=14&bt=0&bts=0&zu=http%3A//www.islaam.com/Article.aspx%3Fid%3D51) Dr. Ja`far Sheikh Idris writes about the teachings of the Koran: These are beings of a different nature from man. While man is created from soil they are created from light. [Sahih Muslim, Kitab az-Zuhd, 1227] And thus human beings-except Prophets--cannot see them in their original nature, but may see them if they take a physical form. Our knowledge of them is therefore almost entirely based on What Cod and His Prophets tell us about them. But why should we bother to know about them? Because they play a very big role in conducting our affair. To know about them could Perhaps be said to be useful to us in the same manner as knowledge of the working of natural causes and other people's behaviour is useful. We are told that these almost innumerable beings who are extremely powerful are created in such a way that they always obey and never go against Divine commands, and continuously server and never tire of serving the Lord. [Anbiya', XXI, 19-20; Tahrim, LXVI:6]. But in spite of this they are--as a species--in a lower degree than the human species, and this is symbolized in the fact that when Adam was created they were ordered to prostrate themselves before him as a sign of greeting and respect.[This verse - Isra, XVII:70] has been given (by some) as evidence or the fact that the human species is better than the species of angels. Ibn Kathir in his tafsir of al-Qur'an al-`Azim].

I am refering to the Koran (and not hadiths) as the question asks. I dont think the Qur'an says that man is HIGHER than angels (though if it does, someone else will need to find it - as I am not good at searching). The Koran only says that God told the angels to bow to Adam when he was created! (which does not necessarily imply humans are higher, it may just be to give a sign of respect to a new creation of God).