Yeah, there will be loads still but just not in the feilds close to the stages.
First timme i went, back in 09, we arrived like 7ish an they ended up taking jus out of the site to camp in an extra field, nice and quiet plus plenty of space

Only problem was having to show our ticket to get into an out of the festival was a right pain!!!
Definatly recomend getting in early as possible plus you get the most for your money