Coming from fashion and commercial photography, I have several big prints
hanging in the aisles of our studios, 140x200cm wide (little under 5x7ft).
Half of them have been shot with a canon 450D at 12 MP, the other with
a 5D MkII at 21 MP. Side by side, 99% of the viewers have to guess which
ones are 12 and which ones are 21 MP.
So, 12MP are enough for most print sizes, 16 or 18 leave some room for
cropping, more is luxury but not really necessary for my application. YMMV.
A smaller file size gives me less card changing, less interruptions, less
points where handling errors can occur, and the most vulnerable times in the
life of a camera are with card bay open or lens removed while changing.
Some of you might have exerienced the dramatic increase in IQ when
comparing images straight out of the camera to images with CA and
distortion fixed in DPP.
The 1D-X can now fix this in camera! I expect enormous things from this
monster, and the low light capabilities will be a new milestone if reality
can match the paper form.
Yes, for wedding photography a lower MP count at increased image IQ
and better low light capabilities is a gift.