Focus peaking and face tracking are a function of the mirrorless functionality which is why it is not possible using Canon FF which are all OVFs.
I don't shoot a lot of landscapes but I find it hard to imagine there are many circumstances where the extra DR of a Sony will make or break the need to bracket an exposure. I would have thought if you are serious about landscapes you would either bracket or use filters - any image where people point out how great it is to recover 5 stops of shadows and avoid bracketing I think looks flat and uninspiring.
I shoot a lot of landscapes - just because you
can recover 5 stops of DR doesn't mean you
should! Some scenes are much more interesting if you let it clip. I love the work of Alex Noriega - his photo "The Watcher" is a good example of where not to recover (I couldn't link directly to the image, but it's in
this gallery if you're interested).
I switched from a 6D to a 5D IV and found that, at least superficially, the 5D IV made recovering shadows more manageable than the 6D. More than once the 5D IV has genuinely surprised me on what it could recover - more than once I've bracketed images because it appeared to clip a bit and found that the middle-exposure frame was sufficient. This was shot with a 5D IV, appearing to clip on the highlights and nearly clipping on the darks, but I had no trouble recovering tons of range to my satisfaction:
Not once did I have that experience with the 6D. Granted, that's all anecdotal considering I sold the 6D to get the 5D and couldn't do an on-site real-world comparison.
I'd love to do a real-world comparison between the 5D IV and a Sony a7Riii or a7iii to see if it actually changes my keeper rate, but to be honest I'm pretty satisfied with my 5D IV's DR. As long as I know it's clipping I can usually manage with filters or bracketing.