As Dr Klause writes, they are available in Japan and far more reasonably priced than HKG or Singapore. They are still going up in price despite the Milvus 135mm....
The Zeiss Milvus/Apo Sonnar f/2 (same lens, different casing) is a terrific lens, in some ways, but can
in no way replace the Voigtländer 125mm f/2.5.
I bought and sold the Zeiss 135 f/2 Apo Sonnar,
twice, because (when all is said and done) it is almost useless as a nature lens compared to the Voigtländer 125mm.
The CV 125 has a closer focusing distance, it has 4x the reproduction ratio, it is lighter, it has more than twice the focus throw, and (ultimately, IMO) it produces better, more pleasing images.
I
love the images my CV 125 produces ...
I did not 'love' the images I got from the Zeiss Apo Sonnar (aka: Milvus 135).
Yes, the Zeiss is sharp, very sharp, but it over-saturates the colors in my opinion, and its extreme sharpness + almost harsh, over-saturated colors were not 'beautiful,' imo.
It also renders colors a little on the warm side, for my taste.
By contrast, the CV 125 renders colors almost perfectly. There is a "naturalness" to the images produced by the CV 125.
The colors are smooth, beautiful, and it is
sharp enough to stand out as excellent, without being
so sharp, and
so saturated, as to look harsh and unnatural.
I could never justify bringing the Zeiss APO Sonnar with me on a nature hike: too heavy, too limited in what it can do.
By contrast, I would never think about going on a nature hike without the CV 125.
It can do anything the Zeiss Apo Sonnar can do (as well or better, IMO), and there are dozens of field applications the CV 125 can do ... that the Apo Sonnar/Milvus can
not do.