To add another voice... I prefer M43 for landscape.
It's lighter and smaller, which is easier for transport and in the field. I shoot handheld, so both the outstanding IS and greater DoF work to my advantage. The lenses available now are outstanding, the new 12-100 looks like a great choice for landscape, and there are several other potentially excellent lenses on the horizon.
My largest print size is currently 17" x 22". I've done side-by-side comparisons with a Sony A7R II, and the differences in resolution are very subtle -- as in, you'd really only notice when the prints are right next to each other.
DR is a little more noticeable, but only in those situations where the scene exceeds the DR of the M43 but not the 35mm. You also need to be more precise in your exposure. Auto bracketing is an easy way to ensure you've nailed the exposure.
There are several other features I rely on heavily -- e.g. aspect ratios, larger and brighter view in the finder, automatic review in the finder, previewing in B&W.
Since I'm not making wall-sized prints, I have no problems sacrificing a small amount of image quality in exchange for the advantages.