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How does the 70-200 F4 compare to the 24-70?
For focus speed? Seems like I've heard the 24-70 is one of the fastest out there, but I guess someone will compare it at some point. I was never too unhappy with how fast the 80-200 f/2.8 focused on my D300s, but the 70-200 f/4 is clearly faster. And really quiet. And light.
Is the 70-200 II worth an upgrade from the 80-200 AF-S?
Are you asking about the 70-200 VR II f/2.8?
Either way, I'd say the big difference is going to be sharpness, especialy in the corners, and the utility of VR. My guess is focus speed isn't massively faster.