As much as I agree with what Lazy has said about the differences between Jinbei and Luffy with the key factor being experience and knowledge of the sea; I can't picture Mugiwara being defeated now. Obviously, as readers we've seen Luffy over the years (first hand experience) in his development and fighting abilities. That not giving up will power will most probably get him through this. I honestly hate the fact that these two had to clash so early. So much Anti-Fishmen hate. D=