I did use it for a time and it was a good performer. Nevertheless, I shoot a lot wide open and anytimes a subject was not in the center, it resulted too soft to my taste. This was my main bug with it. Also, I prefer the smoother bokeh and stronger contrast of the Summilux Asph but this is personal taste.
I easily deal with focus shift on my Lux, so it can be done on the CV too.