The Linhofs are heavy. A Master Tech + 3 lenses in your backpack will tell you all about it on a 15km walk through the bush. And you'll need to brush up, quickly, on exposure skills (spot metering, duplex metering, incident, reflective... all have their specific uses, no one method being the best for any one situation), and patience, patience, patience. LF can't be rushed and mistakes happen easily.
Be aware also that the difference between a well exposed medium format image and one from 4x5 will be modest. MF will also of course save you the silly business of loading/unloading film holders (and the attendant mistakes that do happen) and get you a lot more images with a safety margin (in roll film) that sheet film does not afford you.