I was using mine today and was struck by a couple of practical thoughts that I don't think were covered by the review. Regarding the ET-73 lens hood that is included:
1) It has a great matte finish that matches the lens body, and unlike the lens hood of so many of my "L" lens that I have owned, seems highly resistant to marking. I hate trying to sell a lens where the body is flawless but the hood looks like worms have been tunneling over it.
2) The hood, when reversed, fits tightly around the lens body with a maximum of about a 1/4" clearance. That means that it takes up far less bag space than some lens whose hoods add so much width. It is a reasonably long lens, but because of the narrow hood takes us less width than either my 135L or 24-105L.
Little things that add up in the end.