Many people have waited a long time for those two lenses, so finally they are now readily available.
The Zeiss Batis 18mm f/2.8 (world’s best extreme wide angle, and eclipsing the ZF.2 18/3.5 Distagon in performance) will likely be hard to come by, so pre-order the Zeiss Batis 18mm f/2.8 now to get in the queue. See my review of the Zeiss Batis 18mm f/2.8 Distagon in Guide to Mirrorless. I’m really looking forward to using the Batis 18/2.8 in the Eastern Sierra/Yosemite and White Mountains soon.
See also my review of the Zeiss Loxia lenses.
Sigma 50-100mm f/1.8 DC HSM Art
Separately, the Sigma 50-100mm f/1.8 DC HSM Art (for APS-C is now in stock). Looks like a 'killer' lens for APS-C shooters. As compared to full frame, it is equivalent to 75-150mm in field of view and f/2.7 in depth of field / blur potential.