I've been wrestling with this too. My main subject is my ~1 1/2 year old daughter who, of course, doesn't stay still for long. I was shooting her at ~f/2.5 with my 50 mm 1.4, but the photos weren't as sharp as I felt they should be with that lens.
A photographer friend suggested I 1) Try practicing at least at f/4 for a bit, since I'm not a super-experienced photographer; 2) DON'T use the center focus point and use switch to the correct point instead and 3) move my auto focus to AI Servo on my Canon XTi to help to better track my toddler.
I tried this yesterday and got MUCH sharper shots and good bokeh too! Hope that helps...
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