Replying to Clarity: goPro vs. t2i/7d

i am only using iMovie and with my GoPro footage it looks identical to a lot of other edits i've seen, where the GoPro is used; Compton's WEAK webisodes especially (i use the color gradients as well in Imovie similar to his). however, in his WEAK 10 edit, where the 7D was used, the clarity is very good. A lot of other cine reels show this too, but is that just the rendering from FCP? can i get that from iMovie as well? if so, what do i need to "change" during my export from iMovie to Vimeo/NS/youtube, etc...to get that same vivid and sharp image (my 7D footage has some noise in it similar to the noticeable style of footage that the GoPro takes).

thanks guys!