With more and more info on the new Sigma 50 Art available, I´d say that Canon, Nikon and Zeiss really need to check up on their lens strategies. If Sigma delivers the same optical quality on more lenses and fix their bad (and deserved) AF reputation ...
I'd say Zeiss is likely hurting the most from the new Sigma 50mm, they've just released a very similar lens targeting wide open sharpness where as Canon and Nikon's lenses are either a lot smaller/cheaper or target other kinds of performance.
I'm not sure I see a massive market for a Zeiss 85mm 1.4 otus either personally given than Canon and Nikon's existing cast 85mm's both perform very well optically, far better than their 50mm lenses.
If theres a gap in the market right now I'd say its more for something like a 24mm 1.4 with excellent boarder performance for example.
I have to think the market for any $4,000.00+ prime lens in the basic 24mm to 135mm range is tiny to begin with. They have to be cutting that market significantly by being too afraid of failure to even try to make a pro quality autofocus mechanism that they are confident enough to put on one of these lenses. If Sigma can make a lens that is, say, 98% as good for just under 25% of their price, WITH AUTOFOCUS, they have to be just a little nervous over at Zeiss.
Also, what has happened to Canon's "Year of the lens"? We are into 2Q of 2014 and not even announcements of future releases, much less actual lenses? Canon seems to have longer lags between announcements and releases than, say, Sigma, so they'd better get cracking. Perhaps it will be the Year of Uncharacteristically Abrupt Releases
? It would almost have to be.