A study from 1/100 through 1/400 in 1/3 stop shutter speeds is now published showing the degradation under ideal studio conditions at a fixed aperture of ƒ/4.
I would call this study “best case for the A7R” because I did my very best to help the camera avoid any issues. The Red Barn example shows greater losses in the field for both the 55/1.8 and Leica 50/2 APO (crops shown for both in that example), but with exactly the same blur pattern.
In simple numbers: 36 megapixels becomes ~24 in resolving power terms (maybe even less), due to this shutter vibration.
The actual-pixels crop below is from the Sony A7R at peak resolution—no degradation and razor sharp complete with color aliasing, spurious resolution and moiré. Exactly what should be recorded. The blur improves some of this, effectively acting as an anti-aliasing filter! But it degrades and dulls fine details.