There is already a short review with lots of pictures and, well I know, one can't trust everything written on the net, but that 21mm Loxia looks good.
#423. Zeiss Loxia 21 ? Two brief reviews of a brilliant new ultra-wide | DearSusan
The lack of AF could be a problem with my bad eyes.. But who needs AF with a 21mm ? when f8 and zone focusing can do the trick..