i'm sick and tired of reading how IS would make a lens so much heavier and biggerand compromise image quality ... bla bla bla ... just a bunch of completely unfounded urban myths.
e.g. look at EF 70-200/4 L without IS 76x172mm, 705g and EF 70-200/4 L IS with IS 76x172mm, 760 g ... so a paltry 55 grams more .. for a lens with pretty big glass elements to be stabilized. And image quality is better on 70-200/4 with IS too. Price difference is excessive though, and purely marketing driven.
EF 24-70/2.8 L II should have been IS from the start ... especially at the price differential over the previous version.
Not a really well thought out post, is it, buddy?
You're comparing a much older lens, the 70-200 f4, to a much newer lens, the 70-200 f4 IS. In the time difference between each's respective introduction to the market, Canon has improved both their optical designs as well as materials used. So while, yes, the available lenses that you listed are close together, your argument is invalid. Had Canon made a new and current version of the non-IS 70-200 f4 at the same time as they introduced the IS version of the f4, the weight of the non-IS would be less due to those advancements I just stated. So yes, IS does add bulk and weight to a lens, it's just that we don't notice much, because at the same time there are also improvements in weight reduction.
That being said, people complaining about a little extra weight really need to grow a pair and hit the gym a little. I work out regularly, and I've never had an issue handholding my 300mm 2.8 lens for a whole day whether it's my kids' sports or at the racetrack. I have a 400mm 2.8 now, and I also do okay with that for several hours. If it's a really long day, like an all day shoot, then it gets a little tiring, but nothing where I stop shooting. To hear whining about "heavy" lenses, like this supposed lens, which would be about 2 pounds, is hilarious. It's not an issue if you take care of your body and exercise a bit. Do you realize how pathetic and weak you sound? My wife takes care of our kids everyday. Our infant can't even walk yet, and he weighs more than a Canon 800mm f/5.6. She never complains. I'm sure any mother would laugh at you people who complain how a new lens will be too heavy for all day use.