I would like to have a serious discussion. I am not going switch in haste, I am justing thinking about this issues. So please, no flames, etc. Well thought out comments are welcomed.
Comparing Nikon and Canon bodies here are my thoughts
5D M3 no match
D800 no match, when/if Canon comes out with a high MP body, it is likely to be expensive.
Canon 1.3 crop in a 1 series body is great, Nikon's FX/DX lacks this feature. The 1.3 crop makes my 500 a bit longer
Not sure how I would compare the 1D X versus D4 (correct body?), but not terribly important since the 1D X is out of my price range.
Canon vs Nikon lenses
Nikon wins in wide angle.
Canon and NIkon both have great mid range lenses (24-70, 70-200). Canon's 24-105 is probably better than Nikons 24-120.
On the long end, similar quality though with the new super telephotos Canon may have an edge in optical quality and definitely on weight. But at what cost?
Nikon has 200-400, Canon has an interested lens in development, not out yet, costs $3000 (?) than Nikon's.
Speciality lenses - Tilt shift I think Canon wins at least for wide angles. Macro - both are great.
Canon - more expensive, lighter weight Super telephotos, weak in the wide angles expect for Tilt Shift
Nikon - less expense, stronger in wide angles,