Image quality results from the Sony a7R II have been added to the Sony FE 70-200mm f/4 G OSS Lens page.
The first comparison I wanted to see was the Sony FE 70-200mm f/4 G vs. f/2.8 GM OSS Lens. When set to f/4, the f/2.8 lens becomes clearly sharper, (mostly). There are many combinations to explore.
The Sony FE 70-200mm f/4 G OSS Lens is in stock at B&H | Amazon | Adorama.