Very best fit to my hands of any camera I've owned is the Olympus E-1 DSLR. Every control is exactly where I want it to be, it's not over burdened with too many buttons and such, and it balances beautifully with the Zuiko Digital High Grade lenses designed for it. Despite being 17 years old, only 5 Mpixel, and having write speed that compete with glaciers for slow-moving, it remains the best in hand and takes great pictures too. (The Leica R8 is similar, has a better viewfinder, but weighs too much. The Leicaflex SL is similar too, almost as ergonomically shaped. The M is very good, particularly the M-D262 and M4-2, and the digital CL is very close albeit a bit small in my hands. Of eye level cameras, the Hasselblad X1D is the closest second.) For eye level cameras, the Olympus E-1 is my summit.
But. That's for eye level cameras. I happen to love waist level cameras just as much and designs that work for eye level cameras are almost never really good for waist level cameras. For waist level cameras, having been through Rolleiflex and Mamiya TLRs, Mamiya 645 SLR, Bronica 645 ETRS and SQ, I've come to rest on the Hasselblad V system as the best to handle. Not the fastest, but the best: A 500 series body with Planar 80 or Makro-Planar 120, a WL finder, and either an A12 or CFVII 50c back just works to near perfection for both hand-held and tripod use. The 907x follows the tradition well although the very short body doesn't give as much space to hold as easily or securely, it needs a grip on the left side angled for waist level hold to be used with the LCD flipped out to 45 or 90 degrees.
Honorable mention for eye level camera use is a Minox B. Walter Zapp did an outstanding job with the pre-metering Minox subminiatures' shape, size, weight and control design; the B's added light meter gave the body just that tiny bit more balance and heft needed to let it balance better and make it nearly perfect. And the whole camera in its case is barely larger than a pack of chewing gum and can fit in almost any pocket without making so much as a bulge.
G