Here are some thoughts on why I made my decision on this particular lens:
- As a practical reason, since I have already got the Leica M system, it is sensible to put most of the tasks on to my integrated system.
- It is compact, though still heavy. With a flouting element design, it is expected to perform better than Summicron 90AA and Summilux 80/75 at close focus. This is important for the portrait use.
- last but not least, it render image smoothly from the in focus areas to the background. We will see how well it will perform.