Remember Minolta being first in AF? Have you maybe tried to lock focus on the Minolta
logo with a camera of the first series AF Minoltas? Dark blue and white, sharp lines - but
no vertical lines. It couldn't lock.
Canon and Nikon beat Minolta badly when they had their systems ready.
Nikon has produced a camera that incinerates wild discussions about the question
if their current lenses can resolve that much. Canon is currently shelling out one lens
after the other - I bet they won't have that discussion so intensive.
Yes, 800 dollars for a 2.8/28mm are steep. But the target audience is not
the regular Joey Sixpack, this lens addresses people who would otherwise
buy a prome for their Phase one camera.
There is still a small edge in quality left in current medium format systems
over 35mm DSLRs. But it is melting faster than polar ice under the ozone hole.
One hour of exposure time might soon be available in 35mm DSLRs as well,
and with diffraction limited lens designs..... I wouldn't invest in shares of
medium format producers now.
Regarding Nikon: There are definitely people who will switch from Canon to
Nikon in a frail attempt to substitute lack of skill with a better camera.
Once canon shows their next thing they might convert back.....
The rest of the market, and especially many professionals is not moving that
fast, continuity in a business is a strong asset.
So.... from a professional point of view I would regard any announcement within
a time frame of 6 to 9 months as de facto simultaneously.
But you certainly will not have to wait too long. There are Canon roadshows
planned staring in March. I think they will carry new stuff, then.