It seems that everyone is advising to get a PhaseOne back. I am not really sure why, but Hasselblad does not appear to be popular on this forum. PhaseOne certainly makes very nice backs, but plenty of pro photographers use Hasselblad cameras and are happy with the results.
Basically, you said you want to shoot portrait, fashion/glamour, landscapes for art sales, product and food, automotive and weddings. You also want to use a 4x5 Cambo for product/food and try a Rollei 6008 or Mamiya 645AF.
What can I tell you?
First, I would forget about the 6008 and 645AF. If you want to try an older film camera, get yourself a RB 67 and don't connect it to a digital back. Or use your 4x5.
Second, I would also forget about the Cambo with a digital back. Using a camera designed for 4x5 with a digital back is not productive. If you need movements for shooting products on a digital back, the Hasselblad HTS is a better solution.
Third: as with anything photography, the real question is not the camera but the lenses. Hasselblad lenses are very, very good and their line-up covers all what one would do with a MF camera.
Now let us see your intended uses:
-portrait or fashion/glamour: any MF can do that, but you need lenses which have a nice rendering and may appreciate a leaf shutter for outdoor flash photography. Advantage Hasselblad here.
-landscapes for art sales: MF is spectacular when printed big (any brand), a leaf shutter avoids vibrations (only on H cameras, PhaseOne still operates the focal plane shutter), which is a big deal. OTOH, prepare yourself for cameras and lenses which weight double what you are used to. Do you want to carry that much weight or rather use the 5D / buy a Sony 7R and 35mm?
-product and food: movements are a big plus and the HTS is simply a very convenient and productive solution when shooting tethered in the studio with Phocus. Phocus automatically computes fall-off and other defects, taking tilt and shift values into account. Use the standard 80mm on extension rings (very good results) or the new 50mm with the specially designed macro adapter (incredibly good results).
-automotive: any MF camera can do that. Save money for the strobes.
-weddings: use your Canon, unless it is for portraits. MF cameras can shoot up to iso400 (50 mpix backs and more) or iso800-1600 (31 or 40 mpix backs) with good results, but the AF system is not as good as what your 5D does. AND the 5D has more convenient zooms.