The camera body will impact auto-focus speed, but most of the sharpness is going to come from the lens rather than the camera body. Throw a sharp lens on a 5 year old DSLR and it will likely look sharper than a kit lens on a brand spanking new high end camera. The camera can only capture the image projected on the sensor. If that isn't sharp, neither will the photo that the camera captures.
Sharpness is primarily a result of the lens characteristics and proper focus. Sharpening can also be applied as an image processing step. If you shoot JPEG, then a setting in camera will adjust how it is processed on the fly. If you shoot RAW (which I highly recommend for numerous reasons) then you capture raw sensor data and can apply sharpening very precisely in post production.