1 “Behold my servant, whom I uphold; mine elect, in whom my soul delighteth; I have put my spirit upon him: he shall bring forth judgment to the Gentiles” 
-Who is this “servant” who will bring forth judgement to the gentiles.
Im guessing Christians dont interpret this “servant” to be Jesus, since Jesus is a “son” or “God in the flesh”.
Pay special attention to the word “servant”…. this servant is key to the fulfillment of the following :

4He shall not fail nor be discouraged, till he have set judgment in the earth: and the isles shall wait for his law.

Who was this servant who would not fail in his mission, of setting judgement in the earth? And what was “his law” that was awaited by the isles?

6I the LORD have called thee in righteousness, and will hold thine hand, and will keep thee, and give thee for a covenant of the people, for a light of the Gentiles; 

-Again, this concerns the gentiles. Jesus declared in his own words that he was sent only to the lost sheep of Israel.

11Let the wilderness and the cities thereof lift up their voice, the villages that Kedar doth inhabit: let the inhabitants of the rock sing, let them shout from the top of the mountains.

-This is good news for the villages that “Kedar inhabits”. Kedar, as you know is a son of Ishmael. Furthermore, I interpret “wilderness” to mean the wilderness that Ishmael entered with his mother. So it appears that this part is relevant to the Ishmaelites….

16And I will bring the blind by a way that they knew not; I will lead them in paths that they have not known: I will make darkness light before them, and crooked things straight. These things will I do unto them, and not forsake them..

-The blind are those who were living in the spiritual darkness of paganism and idolatory. Who were those people who came out of the darkness, and entered a new life of worshipping the God who chose Abraham.

To summarize, this particular chapter seems to be addressing the gentiles, i.e- Non-Israelites. It is prophesied that they will be removed from darkness and brought into the light of the way of God. These gentiles are given a “light”, through a servant of God.

IMHO, this servant was none other than Mohammad.
Reading the whole thing in context….I cant think of anybody else who was declared as a servant, who God said He upholds and declares as His “elect”…. who also had an impact on the people of Kedar and the “wilderness”.
Those who came out of the darkness were those who Mohammad brought out of idolatory and paganism. So darkness was indeed made light before them, and they were led in new paths that they had not known, by worshipping the God of Abraham.