The new Leica Summilux-M 50mm f/1.4 ASPH 2023 version II silver lens is currently in stock at B&H.
Leica Summilux-M 50mm f/1.4 ASPH version I vs. version II specifications comparison:
Leica Summilux-M 50mm f/1.4 ASPH 2023 version II lens MTF chart: