all good and great film photographers post-process. not a one that you would see published in a magazine, consider buying their book, or deem a "master" ever simply drops off their film for developing.
they sharpen them using unsharp masks (yes, the very same name given to "digital" edge accuity enhancement; check the history of that evolution for an eyeopener). and this after using the highest resolution capture mediums possible (large format film) and the sharpest lenses money can buy in the field.
to heighten contrast, they use contrast masks, dodge & burn, and higher contrast film stocks to increase black levels and micro-contrast, very similar to digital darkroom techniques designed for the same end result.
as an earlier poster noted, choosing velvia as a film stock (virtually the industry standard in landscape for over two decades) is no different than pushing saturation and vibrance sliders in the digital darkroom but with far less control over amount, with a narrower color gamut, and a preset daylight white balance. color manipulation from the very moment the purist loads the film!!
post-processing ideas didn't start with digital; virtually every digital enhancement technique (sharpening, saturation, contrast enhancement/recovery, etc.) has an antecedent in film darkrooms, which all good and great film photographers have always employed!! many of these techniques were first innovated to solve the technical inadequacies of cameras, film and memory card in reproducing what the finest optical instrument known to man (your eye) can see.
look at the earliest prints of ansel adams' "monolith, the face of half dome:" blocked up face of half dome, not remotely the fully realized (and real looking) print of twenty years later. only his artful processing of the negative, and innovation of darkroom techniques allowed the real masterpiece to come thru. and for this, you deem him not a pure photographer, rather "a Master Artist, and a Master Image-Maker," instead suggesting that a man like Manglesen would, "strictly-speaking, be the true Master Photographer." the height of arrogance and inexperience, if you ask me.
like it or not, the "no digital manipulation" claim is, as another noted insightfully, disingenuous at best and, at worst, purely hypocritical marketing hype at its most cynical. it seems retail photographers can't get the words out of their mouth fast enough these days claiming, even those working exclusively in digital (!), that their processing is purely natural, nothing but natural light, no manipulation, exactly as i saw it, and please buy my one of a kind, completely pure, limited edition (one of only two hundred . . . until i reach 199, and need to sell some more while still hoping to appeal to society's wise investors with that truly pure baseball card collecting, art treasure, appreciation [$$$!!!]-minded mentality) . . .
it seems the public is suspect of manipulation, tired of being faked, and almost uniformly uninformed enough to go hook, line and sinker for the "no digital manipulation" ploy.
real photographic integrity would be to simply state your philosophy, transparently and honestly discuss your process, and let the work stand as it might.
or we can simply use your definition and categorically state the only master photographers are those that do nothing but shoot in the field, get it perfect (which, don't get me wrong, is still the very heart and soul of great nature & landscape photography!!), and then drop it off at the local walmart for some cheap but 'pure' hack-level post-processing.
and just so you don't get all a-twitter, tom mangelsen is one heck of a fine photographer, doing it right, no matter what his claims and however he manipulates his images. his patience, photographic knowlege, understanding of animal behavior, perserverence, and fine artistic sense are what make him a true 'master.'
www.dvbphotography.com