Here is where i am at, it is a little complicated. Basically, here is my current setup:
A. 5D II - 16-35mm f2.8, 24-105mm f4
B. 1D II - 100-400mm f4.5-5.6, 85mm f1.8
Camera A uses the wide angle lenses, i prefer full frame but i don't mind a 1.3 crop.
Camera B uses the 100-400mm, i have to shoot from a far distance and i use this 80% of the time. Eventually i will buy the 70-200mm II possibly, but i just love my 100-400mm.
I am looking to sell my 5D II and either get the 5D III or 1D IV. I have the 5D III on preorder and have to decide if i should cancel it or not within this week.
I shoot outdoors in all kinds of weather and i have to be very quiet when i get close to the subject, so a silent shutter option on the first camera A would be a really really great feature. I also shoot inside a church where the shutter echoes so the quieter the better (live view is not an option, already thought of that).
My boss thinks megapixels doesn't matter, he doesn't mind my 8mp shots from the 1D II, he thinks weather sealing and newest features / best image quality is best, with emphasis on weather sealing.
So i probably should go with the 1D IV, but i would have to get it used which i would prefer not to do. If i go with the 5D III, if the weather sealing is good enough i could end up buying 2 of them and not upgrading my 1D II and just keep that as a back up.
And in regard to the 1D II, i need to upgrade that too ASAP. The camera is nice, but i REALLY need auto ISO. I have missed a lot of great shots because i didn't have this feature because of my high f-stop requirements of my 100-400mm lens and the crazy exposures it comes up with when zooming in really tight. Sometimes i'll be at 400 shutter speed and when i zoom into a bunch of people with dark outfits (this happens a lot) the shutter speed drops to 100 or slower, which will almost always be blurry if i don't catch it. Having auto iso jumping up to 1600 or preferably 3200-6400 would be a killer upgrade.
Lastly, i really love the 5D II. The images were amazing, but the poor weather sealing was NOT good. I shoot under an umbrella and there are shots that i have to get, and there is a lot of walking involved. In one heavy down poor and high humidity, my 5D II's LCD broke while my 40D survived much better in such weather. If the weather sealing has been greatly improved, i would happily buy the 5D III.
I am desperate for some advice, my boss is a nikon shooter and is very little help