With DPR claiming that the "shutter shock" of their K-3 III under test was unavoidable by whatever means at low ISO speeds of 100 and 200 with a lower shutter speed, I have tried to resemble their test using the same ISO, time value, lens model and focal to verify the case. Here we go:
So, any shake and "shutter shock" that you can see? I don't, do you? :-D And, I took my shots handheld through the finder, without any tripod but with SR turned on.