Originally posted by DaveSimo just buying an FA 31mm Ltd? I think this might just be wide enough
You might find
this blog post interesting. The author's statement that "there is no one lens that’s better for landscapes than another" is a little hyperbolic but read the context and you'll understand. Not every landscape shot needs to be wide angle, and some stunning landscapes are made with telephotos. Keep yourself versatile so you can look at what a given scene gives you and choose the composition that speaks to you.
The FA31's famous "pixie dust" is most apparent when there is some separation between subject and background -- environmental portraiture and such. It can be recommended unreservedly to any K-1 owner on that basis -- I adore mine -- and it's also a fine landscape lens just because it's a great lens all around. But if you're really concentrating on landscapes, I think Mirocal's recommendation of the FA 20-35/4 makes a lot of sense. It can go quite a bit wider than the FA31 when the scene calls for it; and at those times when you want an even bigger angle, if you don't have an ultrawide in your bag, a few shots at 20mm stitched in software might be just the ticket.
Here's a thoughtful review of the FA 20-35 by one of our forum members, "northcoastgreg."