If you're going to rent a 70-200, don't get the f4, go for the f2.8, the sharpness is amazing. You also may want to consider renting an L Prime, as they also produce good results.My friend doesn't want to use my bodies because he wants to be able to put all the good ones that he took in his personal portfolio. Weird but he doesn't want to get his clients hopes up by using a body that he doesn't have. Its his personal preference.
Yet he wants to use a rented lens?
So if we go for the f/2.8 should we get the non-IS or the IS version?
Lenses aren't a big deal for him. He can rent all the lenses he wants. It's the body that he really wants to wait for. He will not shoot with a FF camera until he has his own. He's set on that ideology. I've tried telling him that 5Dc's aren't that expensive.