Rokinon/Samyang have come out with a couple of interesting-for-night-photography 14mm lenses. I’m particularly interested in the f/2.4 SP variant, but there’s a f/2.8 AF that looks pretty good as well.
Before you roll your eyes, yes their previous 14mm (the UMC) wasn’t all that great (mustache distortion, loads of vignetting at 2.8), but these look to be pretty good.
BTW, yes, there’s a module for the UMC version. There’s also one for the IRIX 15mm f/2.4 - but there are currently two of those (the Firefly, and the Blackstone) and [update] I now know that they’re optically identical.
Thanks!