IMHO the largest aperture prime lens you can afford would be most useful, as suggested by Mr Cat. So often one runs out of daylight before one runs out of subjects, and turning up the ISO can cause noise.
Why go back to that frustrating, expensive film business ? Although I've always fancied the Hasselblad the Americans left on the moon ...
In 35mm film camera terms, though, since we all have different conversion factors, 35mm focal length is said to be the nearest to our own field of view, but I can sympathise with 85mm too. 50mm was always an unsatisfactory compromise.
My qualification to comment : I used an Olympus OM2n with several OM lenses for 30 years, then tried a compact digital camers (ugh), now have an Olympus E-510 DSLR with entry-level short and long zooms which perform as well as the OM-System lenses.