This is an interesting discussion. Before I got into MF, I shot mainly with the Canon FF, using a 16mm lens, at f16, everything from 3 ft to infinity is in focus. That is a simple formula to remember. The longer the lens, the less DOF naturally.
I think as DMS says above, what is equally important is what is the end product that is desired. For me, landscapes mean large prints - at least 20X30 which will be viewed from around 3 ft or more.
With wide angle shots, you always need something in the foreground, close to the camera if possible. However, there are no really wide angle lenses for the Z yet (the 25mm is not available).
There are two apps for the iPhone I am working with right now, the
OptimumCS pro and the TruDOF pro, they are a bit more detailed and useful than DOFmaster and other simple apps out there, allowing you to adjust for print size and resolution. Not sure if they will work for everyone but if you have multiple bodies and lenses like I do, it is hard to remember all the hyperfocal distances. They are a bit pricey, but given how much we spend on our equipment it may be well worth the money to get something good.
Pradeep