It was painful to do, but I sold my 50 f/1.2L two months ago in lieu of this lens. I'll miss its stubby little body and the fine shots it often produced. I will miss f/1.2 as well, but I can live with f/1.4.
Sigma's 35mm 1.4A is absolutely fabulous, but in practice it's a bit too wide for what I want from an f/1.4 lens. I may sell it as well. I pre-ordered Sigma's new 50 after reading the reviews that have just surfaced. I'm sure there will be howling about nervous bokeh and lateral CA from some, and in some cases it'll be warranted. Either way, I'm still going to give this lens a chance, as there's absolutely no way I'd give Zeiss 4k or buy the 50L the third time around. If this guy turns out to be a dud in any way I'll bury my head in the sand and wait for a possible new fast 50mm offering from Canon. If that ends up being the case, something tells me I may be waiting quite some time.