Sorry
@Ian W , only just seen this.
(You should tag me - I no longer get notifications of posts to this thread!)
Yes, I have the Laowa 9mm. I like it a lot. It's very small and compact. It seems to be very well built and sturdy. To my eyes it is sharp all through, though I've seen reports of pixel peepers blowing images up to 300% and then complaining that the "might" be some softness in the corners. The same people who see worms I presume?
Looks pretty distortion free in this shot...
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though if you stand really close to verticals and shoot upward you do get parralax errors - is there a lens that doesn't do that?
You get some strange effects shooting directly into the sun (remember what the sun is?)...
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The only real downside - if it is one - is that the aperture ring turns the "wrong " way. Not usually a problem, but I was shooting on my back at arms length and decided to go wide open, but selected f2.8 instead of f11. Cue one out of focus shot!
It won't suit everybody, but I'm happy with it.