No of course buying gear doesn't make one a better photographer. But I also think she came here asking for legitimate help, and banging on her about not knowing full manual isn't particularly helpful, either.
Full Manual is not a a requirement. I would never say it is. Full Manual would get in the way shooting movement, no doubt.
A photographer who is shooting "sport" mode over Tv has work to do in leaning the mechanics. I guarantee that. There is no advantage to a person who understands how modern cameras work. It tells me the user doesn't fully understand the camera and should probably work on technique to produce better work.
Getting closer can be as simple as using one's feet.
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is it possible that it depends on the lens? I have to say I personally only shot with two Sigma lenses and both were higher end (120-300 2.8 and 50 1.4 art) but i didn't notice a speed difference really.
Sure, lenses all vary to some degree due to differing production tolerances. AF speeds and accuracy is something Sigma will likely never match Canon on, as they have to reverse engineer the AF system for each lens they make. My 30mm 1.4 has it uses, but AF speeds and accuracy are no match for even the cheap canon kit lens I got with my first SLR. I don't have micro-adjustment on any go my camera bodies, so peoples' experiences will be different on fancier bodies.
[doublepost=1473179905][/doublepost]When you are ready, something like
this lens is probably more appropriate.