I have the 24-70 I, just upgraded. I am used to the weight, was surprised, for some reason, I forgot the new lens need a 82mm filter. I will order one today. I just put a B+W clear on my lenses because a few months ago, someone (it could have been me), put the camera bag down a little hard and the filter cracked, the lens was fine. Three years ago, my son dropped my bag and cracked the filter and I could not take it off the lens, had to send it to Canon. They fixed the front ring good as new. I don't totally baby my gear, but it's nice not to have an expensive repair.