Zeiss Batis 25mm f/2
Get Sony A7R II and Zeiss Batis B&H Photo.
See also the same scene with the Zeiss Batis 25mm f/2 Distagon.
In my review of the Zeiss Batis 85mm f/1.8 Sonnar:
Zeiss Batis 85mm f/1.8 Sonnar Aperture Series: Yellow Flowers by Waterfall
Includes images from f/1.8 to f/13 at sizes up to 24 megapixels, with many large crops also from f/1.8 - f/13.
As one might expect from the measured MTF chart, the Zeiss Batis 85mm f/1.8 Sonnar shows world-class contrast matching the very best Leica M lens (whose MTF is not measured but computed).
In the field, I found that the Zeiss Batis 25mm f/2 Distagon and Zeiss Batis 85mm f/1.8 Sonnar made an outstanding combination. But I would like to see a 40mm f/2 added to that mix (the Zeiss Loxia 35mm f/2 Biogon is manual focus).
f4 @ 1/25 sec, ISO 100; 2015-08-14 17:33:28[low-res image for bot]
Sony A7R II + Zeiss Batis 85mm f/1.8 Sonnar