Get Leica 28mm f/1.4 Summilux-M ASPH at B&H Photo.
This series reveals key performance issues with the Leica 28/1.4 Summilux-M ASPH, and should be considered a must-read for any Leica M shooter using this lens.
Includes images up to full camera resolution from f/1.4 through f/8.
To give Leica credit, the 28/1.4 is an exceptionally small lens for its focal length and speed. When that design goal is accepted, the price escalates hugely, and even so some optical compromises must be made: in the context of its size, it is an outstanding performance. Yet in the context of absolute performance, I am spoiled now by Zeiss Otus (the 55mm and 85mm released so far).