Sorry, but that is just not true. While I use a tripod most of the time for landscapes, there are times where I want to travel light on a hike, or will be hiking through an area where using a tripod is not practical (Watkins Glen comes to mind). Also, shots from boats I've been on in Hawaii and Alaska where a tripod does not work.
While I will be upgrading my 17-40L to this lens mostly for the improved optics, it's nice to have image stabilization available for those times I've mentioned above.
Yes, there are cases where I am sure you want to travel light, I typically do not take DSLR then
Yes, I also agree there are applications for this lens without the tripod. As a general rule, landscape photographers use a tripod and do not use IS.
Repeat again, I am not against IS. It is just sharpness and resolutions is why I would want to have a lens, not IS
I would not purchase a "portrait" lens without IS though...






