[wim]

So I wonder what the catch is. Field curvature?

That it does not fit on your camera :O

I don't think it would have been on my radar even if it had fit. I don't need just every lens on the planet, you know, even though at 8 lenses in stock, I might look like a hoarder.

8 lenses? OI would not call you a hoarder at all. IMO, you are only a hoarder if you keep lenses you do not and/or cannot use any longer.
Of course with that definition I am not a hoarder either, with a total of 39 lenses including converters, extenders and speed boosters ...

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Good to see that a small super WA like this one can be pretty good. Not my cup of tea as it is way too wide for casual walk around. I would take zoom over it as being so wide it is difficult to sort out the framimg just by making a step froward or backward. 
Yet, always nice to have an option.

I wish a lens like this would have been available 40 years ago. I got a 20 mm lens back then, and a 15 mm was possible too, but the latter was 3x the price. and very big and heavy. The 20 mm was a month salary back then ....

It was a great lens at a time, but a wider lens would have been extemely useful to me for my purposes at the time. Of course now I own a 10 mm rectilinear lens, and a 17 mm TS lens, so I am not really complaining.

However, I may get one. Size and price seem rather convenient, and the sample photographs I have seen really look good ....

Kind regards, Wim