Photozone tested the Zeiss Fe 16 35mm and they liked the lens.
“It is capable of delivering sharp results at medium apertures. In fact it’s pretty much excellent around the 20mm mark especially considering the 36mp sensor of the test camera. The weakest spot is at 35mm where the corners could be better at f/4 and f/5.6 but beyond they are just fine actually.”
If you are into mtf charts, head over to photozone and read the full report.
I purchased the lens as soon as it became available and absolutely love it.