For me, the reason is that I already have the Panasonic Leica 25mm f/1.4, which also has character and has autofocus. Also, the Mitakon 25mm isn't offered used very often, and I haven't seen good prices on it (at least not better than the € 275 that I paid for my PL25). However, if I see one offered for a good price, I might buy it and test it out.
I have been browsing sample images of all extremely fast budget primes and noticed a clear trend which is repeated in this thread as well: nobody ever bothers to share images which are actually taken at f/0.95 which should be the sole reason for the existence of this lens. I'd like to buy a 15 or 25mm f/0.95 lens to take low light MFT images which are possible only at f/0.95 so it's irrelevant how the lens performs at faster apertures because I have already way better lenses for that but it must really be optimized for f/0.95 which is the case with Voigtlander.
Unfortunately samples are in line with the reviews I have seen online. They claim that optically these chinese lenses are so bad wide open that they must be stepped down to f/1.2-f/1.4 - also one full stop - before they produce acceptable results. Those few nightime samples shot at f/1.4 are nice but no better than what Leica or Sigma f/1.4 could take and these two have AF so they are good for low light sports shooting/video as well.
So where's the whole point? The best price I find for Mitakon 25mm is almost 400€ and even then I have to order it from China. This would be bargain if Mitakon is an alternative to Voigtlander f/0.95 but it's a *lot* for a manual no-brand lens that's only usable above f/1.4. Is someone selling these on ebay at half the price?
This makes no sense because even Leica 25mm f/1.4 is cheaper if I take the risk and order something from eGlobal Central again. So, did I miss some essential benefit these "f/0.95" budget primes have?