>>3035630I used to own the 28mm f/1.8 and it was an amazing lens. I also had a different 20mm lens but it was just too goddamn wide, it was a really special purpose sort of lens I never really got used to and I didn't use it enough to justify owning it. Are you sure you want such a wide lens? Even 28 is a pretty huge difference from 50, you might get a lot more use out of it.
Landscapes aren't necessarily all about using the widest damn lens you can get your hands on either, and even if you do occasionally want a really wide photo you can just make a stitched panorama with a longer lens. Take something like pic related. I could've used an ultrawide to get all of it at once, but I didn't feel like carrying a bunch of shit around so all I had was a 50mm lens. I still managed to stitch together the photo I wanted out of handheld shots without a tripod.