I tried Zeiss 18mm f4 ZM with Lumix S1R, and I was pleasantly surprised to find that there was no purple fringing whatsoever - in jpg and RAW. Same lens with Leica SL resulted in ugly bands of purple on the sides, which I find very difficult to remove.
If any of you have tried their non Leica M mount lenses on Lumix S1/S1R, please share your experience on purple fringing