Well, after seeing some of the suggestions, it is interesting that nobody mentioned yet the elephant in the room: the upcoming Sony A7RII.
This camera seems the one to go for serious landscape photography in 35mm format: high res, great sensor, small, light, ticks all the boxes to be at the core of a small landscape system.
The other great benefit is the fact that you can mount top quality landscape lenses, like the TS lenses from Canon (EF 17 and EF 24). Plus, of course, all the wonderful Zeiss glass already mentioned (plus the upcoming Batis lenses). Or, if you prefer zooms, Canon's EF 16-35 f4 is arguably one of the best wide angle zooms these days.
So, a lot of options...