Finally got it today - somehow it was sent without any postage on it, so the post office naturally held it until it was paid. What I think happened is that he handed it to the post office counter clerk who logged it in as a tracked package but didn't actually stick the postage label onto the package. It's a bit incompetent but I got it in the end.
Needless to say the weather was lousy, but I took it to the park and tried it out on some familiar landmarks such as the Italian Gardens and the Albert Memorial.
Sometimes the curving effect is very surreal, a bit like Inception etc.
There's no chip so my camera doesn't meter with it fitted, but I'm used to guesstimating exposure and only had a couple of duds, and on a digital camera a trial photo or two isn't much of a problem. My initial thoughts are that this will be fantastic in areas with interesting architecture etc., and that I really ought to carry another, longer lens when I use it, since it's a very specialised optic and isn't much use for general photography.
The full album is here
Samyang 8mm T3.8 Test | Flickr