I am asking for your patience and experience. I am a newborn photographer and I need a better camera. Considering current and new line-up Canon, what would you suggest. I shoot hand held natural daylight, often low light, and, like everyone else, I need perfect focus. Weight matters, but image quality trumps all. Need to get the shot in a split second. Frequently use 24-70 mm f/2.8. Thank you for taking the time to consider this question.