Why do people ignore the 70-200mm f/4 IS? It is stunningly sharp, almost as sharp as the "best" f/2.8s, and a fraction of the weight and price.
Indeed, and those are the reasons why I own the f4 IS- less bulky and heavy than the 2.8, so good for travel, almost as good or as good optically and a lot less money! I couldn't justify the expense of the 2.8 but the f4 gives me most of the 2.8's performance with the exception of the max. aperture. Having said that, sometimes it would be nice to have the extra reach of the 70-300L in a single lens.