The Fuji is a nice camera. I think that they should have upgraded the body to attract more users looking for better camera performance.
It's also got good Dynamic Range. But, your KM 5D is no slouch in this area. The tone curve used for it's jpeg images leaves a bit to be desired. But, shooting in raw, it's pretty hard to beat unless you go with the Fuji S3 Pro.
The Konica Minolta Maxxum 5D even outperforms the Canon EOS-1Ds Mark II
for Dynamic Range shooting in raw and converting with Adobe Camera Raw (overexposing with both to achieve best DR), according to Dave Etchells' results with Imatest:
The EOS-1Ds Mark II
is Canon's most expensive professional Digtal SLR (current street price of about $7000 if you shop around), with a sensor the size of 35mm film. You can get a KM 5D for less than 1/10 the cost of the Canon (and the Fuji is far less expensive, too).
Of course, you don't get anti-shake with the Fuji, and if you're shooting in low light often, it's a nice feature to have, especially since it works with any lens, including bright primes.