Performance at wider apertures of Leica M lenses and Zeiss ZM lenses on all mirrorless cameras to date (~April 2019) is poor in outer zones. This series from f/1.4 through f/11 confirms that finding with one of the best M-mount lenses, with the key point being at which aperture the lens starts being nicely sharp.
In Walkway Through Grass at Night as well as the nighttime examples, the Zeiss ZM 35mm f/1.4 Distagon fails to impress in the outer zones, with f/4 the minimum aperture for performance to the edges. In other words, it is impaired substantially by the sensor cover glass at f/1.4, f/2, and f/2.8 and somewhat impaired at f/4. See MTF on Mirrorless Cameras for the huge loss of MTF caused by the sensor cover glass.
In diglloyd Leica M:
Zeiss ZM 35mm f/1.4 Distagon Aperture Series: Moots MTB by Creek in Forest (Panasonic S1R)
Includes images from f/1.4 through f/11 at up to full camera resolution including an frame at f/5.6 in Multi-Shot High-Res mode. Also includes intermediate 24 megapixel size for perspective vs Leica M10.
The Zeiss ZM 35/1.4 was mounted on the Panasonic S1R using the Novoflex Leica M Lens to Leica SL/T Camera Body Lens Adapter.