In general, you will get better sound from ANY microphone plugged into a decent mixer vs. plugging directly in to ANY camcorder.
Two major reasons:
1) Likely better (quieter) mic preamps in the mixer. In the case of Sound Devices, there is no "likely" you an bet that SD has better preamps than Sony.
2) Better monitoring and control of the audio signal (vs. messing around on the camera itself).