My true passion is outdoor photography. However, I have a one year old and I have to say I can't get enough of shooting him! Now that leads me to wanting a better portrait lens. I'm currently using the 28-135 that came with my 7D. Honestly, I was surprised at this lens. It performs better than I had expected! I've read about it not being very sharp but I really like it.
Anyway, I still want a better lens for shooting my son. I am thinking about the Sigma 70-200 2.8. BUT that is a fairly sizable lens to be carrying around to the park. What do you all think are some good options?