As expected, the lens is 40% heavier than its ZM equivalent, same as for the other two Loxias. The price however is lower than I expected, although still very pricey and would make me hesitate - the Voigtlander Ultron 21mm 1.8 can be had for significantly less money and even with the close focus adapter, it is still cheaper. Still, the new Loxia seems to be very compact and the 52mm thread is very welcome.
Zeiss Loxia 21mm site.
Early review at PassportsAndLenses.