Don't worry, after years of being on a photography message board it's not the camera it's the ability to Photoshop the pics. :( I can ASSURE you that those pictures have been highly finagled by Photoshop. :(
There should be two different categories of photography now, free of Photoshop and loaded.
after years of photo school and working as a photographer I can assure you those pics have NOT been
"highly finagled" by photoshop. Grant has not done anything different than he would have when he used film aside from different tools for the job. meaning a digital sensor and manually setting his color temperature and contrast etc vs film and choosing a day light balanced film vs tungsten balanced, or choosing a film with more poppy and saturated colors vs a muted portrait film, or choosing to push or pull process that film in development.... and after that there is the printing.... which itself has a whole host of manipulations in color filters, contrast filters, dodging, burning, exp. time, toners, etc
If anything,
if you are a good photographer, there is generally less overall manipulation of a single digital image. most photographers don't even use photoshop anymore as we move into better digital asset management tools that more accurately reflect the darkroom. such as ACR (the adobe camera raw plugin), lightroom, aperture...
and sure, sometimes i think grants work may be a little heavy on the saturation, but he used a very saturated film stock before switching to digital and just wants the same results with his digi photos. it does not take hours upon hours of after-thought and "highly finagled" photoshop work. He learned photography before digital was the norm (and had plenty of film photos published, there are a few on his website, too). He knows how to get the shot in as pure a form as you are claiming (and he used to shoot slides, which is even less manipulation than say... Ansel Adams' photos) but because of digital, things like color temp and saturation are now settings in lightroom instead of being a film and development choice. it is the same thing in a different age.
so i hope we can all get back to enjoying Grant's work and not trying to tear it down claiming it to be fake and taking away from the years and years of photography skills that he has worked hard to build.
It's absolutey amazing. 
Not being a pro photographer it's a bit over my head.
It's a stunning visual, nonetheless. 
