Worth getting the 18-105mm VR with the D7100?
Will this lens stand up to the demands of the sensor and the removed AA filter? Would the 16-85mm have any improvement in sharpness? Sigma 17-50mm f/2.8 better or worse?
My feeling is that the 18-105mm is only worth getting if they are giving it away which in the UK they are not (it's an extra £200).
I've never heard a "sensor" demanding anything. Do they go on strike or just whine at you?
If you demand the maximum possible results out of a sensor, skip the kit lenses and buy the best lenses your wallet will allow. If your skills, technique, and lighting are up to the task, better lenses will give better results with any past, present, or future sensor.