I recently bought this Leica M mount lens for my A7R II body. I am using it with a Voigtländer VM II adapter.
Initial impressions - VERY sharp in the center, even wide open. Corners are predictably soft at largest aperture. Colors are true, with typical Zeiss contrast. Wide-open vignetting is quite pronounced.
It balances very well on A7R II. Feels substantial in hands, but form factor is much, much smaller, and better, than the Sony 35 1.4 ZA.
CA is noticeable when used wide open, but easily correctible. Looked for the corner smearing, or double-image “phenomena” - did not see anything.
Haven’t had much time to take it out, but here are a couple of initial shots. Both taken wide open.