I'm considering this trade. It's nice to have the 28-300 and carry just one lens vs the two but the others are much faster at 2.8. Most of my photography is of my kids so either low light concerts and plays or outdoor soccer, baseball and basketball. The 2.8 is better in low light but is the depth of field too shallow to use with movement such as soccer or plays so you end up shooting at a higher aperture? I have a 5d mark 3 so can always increase the iso. I love the effect of a 2.8 but is it practical to shoot sports wide open? Also would I miss the 200-300 range for soccer and basketball? I'm a novice so your advice would be great. Thanks