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and to be clear, you are suspecting that your AF is having an issue?
or that your camera itself is not sharp somehow.
Because almost any photo that you see online that looks sharp has had sharpening applied in post processing.
Quick 'n dirty example - with a D7000, 50 1.8G wide open - before (straight out of camera), after (quick 'n dirty contrast, saturation, sharpen)
Hmm, this is a lot more dramatic on my pc rather than in small forum images
I'm a big fan of the D7000 but mine needed a fair amount of fine tuning to my lens collection, up to -20 on some copies.