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I think the Nikon 14-24 and the Zeiss 21mm ZE Distagon are the top of the crop in terms of WA lenses on a FF body.
The Canon 14mm F2.8L II and the 24mm F1.4II and the TSE 24mm are also excellent the last one not so hot for astro due to the slower aperture.
I'd also consider the old CZJ Flektogon 20mm F2.8 and the Zuiko 24mm F2.8 lens.
My personal experience is that lens variation from copy to copy can be even bigger than the difference from one brand to the other. A 17-40 F4L can be worst or better than a 16-35 F2.8L depending on which copy you get. So I'd strongly suggest you to try try and try.
One thing I like about the Nikon 14-24 , the CZJ and the Zuiko is that the manual aperture control gives you instant DOF preview in live-view that's nice in terrestrial landscapes.
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