I had the 75-300 years ago, it was soft as you know. I gave it to my daughter who has only a casual interest in photography. I now have the 70-300L which is a superb lens. It is heavy because it is built like a tank but it is in a completely different league to my old lens, razor sharp, fast focusing (on a 7D) and with an excellent IS. I never shoot video so can't comment on that but of course optical will translate across to video.
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