BTW, I'm not really advocating for the 1.2 over the 1.4. I was curious about the 1.4 for a long time, and nearly bought one here last year, but just wasn't sure it would be an all around substitute for my Summicron. The Summicron, plus 1.2 when needed was a good combination that I knew worked.
I eventually picked up a "reasonably" priced Summilux, and it is indeed a lens that does it all for me. The 1.4 Canon might conceivably been also.
I did want to speak up for the fact that the 1.2 is a better performing lens than it is often given credit for.