I would agree based on my observation so far. I followed the fiddler steps today, got it working on 820 (not 810..sorry TMO) and tried couple of snaps with default cam and with Pro Cam. As you said, being same hardware, you feel only diff in process...output looks same to me on cam and on PC.
You can't make an f/2.2 lens an f/2.0, it can't created a faster shutter speed or improve the quality of the glass.
That's where a photograph begins -with the light that the lens sees and captures.