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As to the 45mm FL, it's around 23mm equivalent on 35mm but of course the aspect ratio is very different, so the usual method of determining this is not the full story - the elongated rectangle of 35mm is very different to the rectangular square of 67. What this means is you better have plenty of good foreground because you will be dealing with it every shot, that or crop.
The Pentax 67 is perhaps the funniest camera ever made, many people just laugh when they first lay eyes on one! It's staggeringly huge and yet is a perfect copy of a 35mm film SLR. Be warned the mirror slap is massive. Do try and see one in a adult human hand, it will look like a 3 year old's hand.
Michael Reichmann used one for some time (link below) but I recommend a Mamiya rangefinder for this work - an exquisite camera for landscapes, light, small, fabulous lenses, no vibration (leaf shutter), easy handholding...
67 film done right - it depends on type of film. Fine grain E6 (Astia, Velvia, Provia) will exceed the ~24Mp DSLRs by a small but significant amount, we are talking good exposure, film scanner/drum scanner, film kept flat, then good PS work. Huge files even by todays standards, several hundreds of Mbs of 16 bit goodness to play with.
B&W is a different matter. Digital may never get on par with this superb hi-res technology, a century old or thereabouts, with huge DR and fantastic detail rendition. Ask Zeiss.