Full review will be coming in the next few weeks. These compares right now are quick analysis I use and compare the two lenses. Please see Compare #1, Compare #2, Compare #3 and Compare #4 posted earlier.
Yes. I know most distortion checks are against brick walls or actual grids. But since I don't shoot a ton of brick walls and am not a techie, I decided to shoot my window. I focused on the middle "square" section and held the camera as level as possible Above is the Zeiss - below is the Leica. Both unedited. Amazing how much brighter the Leica is at f/1.4 compared to the Zeiss f/1.5 at matching ISO / shutter.
Anyhow, I'll see if I can track down a brick wall for those that want a more techie test.