I don't see Nikon users flocking to buy it. It's still a manual diaphragm. Trying to see anything through an effective f/20-30 is hard.The number 1 question curious photogs are asking is "how does it compare against the MPE". The tendency or the atmosphere behind that question is, If I buy the MPE tomorrow, I will be a fool cause the Laowa is giving sort of the range, probable lesser price and in a smaller package.
For Nikon, no doubt their world has opened to similar MPE lens.
There are already good manual options, like reversed zooms, or a Canon MP35 on a helicoid or two which is more use at the more useful (in the field, or small sensor) low mag end as well. Granted the Laowa is neat, and would make more sense if one didn't already have any way to do it.
I've not looked at distortion - something to check.
The Optional Accessories for the Laowa are interesting for sure, though I haven't seen much about them.