I haven't seen any shutter vibration on the 70-180.
I think shutter vibration can be overstated or mislabeled.
I'm working an image now where we were blending studios strobes in a daylight studio and image 217 is perfect, 218 blurred, 219 perfect, all with the S2.
Why? Dunno, maybe the model jerked, maybe I had a brain slip, maybe it's just the photo Gods messing with me, but if I took that one image I could post everywhere that the camera had issues.
I think a lot of this just comes down to use, being careful, using a higher shutter speed.
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Chris, I know you don't shoot a lot of people in stills, but how do you find the A7R skintones, focusing, speed?
BC