What about the William Eggleston types of photographer? I don't see a class for his type of photography that I admire so much. I think he called it the "Democratic Camera?"
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Just my two cents, but for me, I'd find an update of the 200 mm f2.8 prime to include IS much more interesting than any of these. Unlikely, I suppose, because it might torpedo sales of the 70-200 zooms.+1
I would buy these too. I hope Canon found it in their, and our, best interest to put a rubber O-ring seal on the mount. It would be a simple thing to do and would add to the popularity of the brand name. Why Canon overlooks this simple modification on all lenses puzzles me.
If weathersealing was as simple as this, all the third party lens makers would be doing it.
The rubber gasket is a bit of a placebo for weathersealing. It's important, but it's only a portion of the sealing a lens needs to be protected from dust, sand and water. A good primer on that is here: http://www.thephoblographer.com/2013/02/14/how-a-lens-becomes-weather-sealed/
A guy was selling a kit to gasket-ize any EF lens for something modest, like $25, on Kickstarter, but it seems to have died despite hitting its target: http://www.kickstarter.com/projects/77243737/dust-donuttm-add-a-weather-seal-to-the-mount-of-an/
I'm off-topic, sorry, but I thought I'd pass that on.