I could be wrong, but 35mm DSLRs supports the widest angle lenses. One of the best so far is the Nikkor 12-24mm zoom, apparently sharp from corner to corner. If the Nikon D3 does not have enough pixels for you, you could use the lens on a 21mp 1Ds3 with an adapter.
To get the FoV that a 12mm lens on 35mm format will give you, you'd need approximately an 18mm lens for a P45.
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the 12-24 is a DX lens no?
the widest FF nikkor is 14
(or the nikkor 8 mm fisheye- film only ?)
I think the OP was wondering which MF camera platform supports the widest lens
that is the 24 supported by cambo, alpa, horseman and maybe more
One may of course be able to get a wider FOV on an MF DB by (flat) stitching with a lense with a larger image circle than the 24 - maybe the roden 28 - I dont know
S