<p>As I have now upgraded from a Nikon D200, to a soon to be delivered from Adorama in a few weeks (I'm deployed overseas with the US Army), I am unsure where the AF updates in the past eight years have actually gotten me. As my current practice is to focus on a subject then recompose, what does the 5d3 offer AF wise that my old and venerable nikon does not? I've heard how it's 'a great upgrade' AF wise (aside from ISO, DR, noise, etc.) but... unless the camera knows what I'M looking at (90s tech anyone? E3 film camera I believe?)...... Can someone explain just what 8 or so years has gotten me in the AF realm?</p>