9 out of 10 points and recommendedExcellent image quality Excellent and fast AF Well balanced Well madeNo IS
I have had this lens almost 9 years and am extremely happy with it. IR must have gotten a lemon for testing as the review has nothing in common with my experience.reviewed March 6th, 2019 (purchased for $1,010)
Even though it is relatively big, it is well balanced and a joy to use hand held in good light, I pull this out far more than my Canon 70~200/2.8 L II which is far more cumbersome to use (lumpy, bulky and just feels heavy). The image quality wide open at f4 all the way to 300mm is excellent and not just in the center. I have used it extensively including for bird photography thanks to excellent and quick AF. For the last few years I also use a Canon 70~300/4~5.6L which has similar image quality and does have IS which helps.
I would recommend this highly for anyone looking for a fast fixed aperture tele zoom. Yes, I would love to have a 120~300/2.8 Sigma, but that is way too heavy for hand-held use.