the vignetting is something that often occurs with wide angles at large apertures, physics, not magic. doesn't even take a wide angle, take a fast fifty, open up to 1.4 (or larger if it's really fast), shoot velvia and there you go, vignetting. shoot portra nc and you probably won't notice, well not to the same degree at least.
i agree, nackebia's photos are amongst the best around. but there's no magic involved, not as far as i'm concerned. just a photographer with a good sense of compos and light, an obvious talent for approaching people (which i for one lack completely), and some photo gear to shoot with. i'm pretty sure he could take an old canonet and make excellent photos with it, of course with a slightly different look but i bet that wouldn't be the first thing one would notice.
as for posting them on dprev as d200 photos, c'mon, what's your thrill?? ,-)
in capable hands, the d200 is plenty camera, capable of excellent results... it's just tools... and we're all just making photos. some have what it takes, others only have the photo gear.