no price available yet for the Z5 UltraWDR, why does that interest you? I dont think its worth it for that level of WDR honestly.. really only gets you SSR, thats cool but not worth the premium.. Its not a big 1/1.9" Sensor
only things I can imagine that being desired is on mobile platforms, ie, trains/planes/automobiles/ships where driving into the sun and needing to be able to see is still needed.