The good wraps at cost are about $2-3 a square foot (my friend is a supplier to all of the big wrap companies). He has always told me if you are paying more than $5 a square foot for a car you are getting ripped and he deals with over 2000 houses.
7x20x$5 is $700 for each long side + the shorter sides. I want to say you could get it done for $2,500. I did my S6 for around $2,200 for one of the places he referred me too.
As for looking better, I can't tell the difference nor can anyone else unless you look from inches away. He had a big booth out aT SEMA (spelling) where he had 3 wrapped cars and 3 unwrapped and put up a contest to see who could tell each from 5 feet. Results were 50% who could guess which was which, so basically dead guess work.
I also live in central US so things are going to be cheaper than if it were on the coasts.