Frankly speaking, I find myself use the 28-300 a lot more than my the other 2 zooms in the same range. I know a lot of photogs get those focal lengths in 2 pieces i,e 24-70, 70-200 because they wanted the f2.8 for certain events. Nevertheless, your 24-104 and 70-200 f4 is more like a walk-around...