The 1Ds is a jaw-dropping wonder, then Nikon brings out the D2 with
iTTL and the most ergonomic body ever. Canon's chasing FF, while
Nikon's releasing a string of awe inspiring dSLR lenses [a current
weakness for the Canon system until they switch to all FF].
People like to emphasize Canon's FF, but I think the real ace in
Canon's pocket is 1.3x. And even better, their 1.3x sensor is CMOS
now. IMHO, 1.3x provides the sweet spot in sensor area, pixel
density, lens multiplier, crop factor, and cost. It will be
interesting to see how Nikon's LBCAST sensor will cope with higher
pixel densities, given that Nikon's current 1.5x LBCAST already
suffers from a fair amount of noise. The other advantage of 1.3x
is that with existing lenses, you can still get good wide-angle.
With a 1D MKII and a 16-35/2.8L, you get a 21-45.5/2.8 zoom. And
at 8mp. (Add Canon's, Sigma's, or Tamron's rectilinear ultra-wide
14/2.8 lenses, and you get an 18/2.8.) With a Nikon D1X and a
12-24/4 DX, you get a 18-36/4 zoom, at 5.4mp. With Nikon, you can
go wider on the zoom, but with a slower aperture. But I would
expect Canon to probably do the same thing if they came out with
their own 12-to-whatever lens.