DP review summary score graph (bottom of conclusions page):
Build Quality -Tie
Ergonomics - Tie
Features - 5DmkIII win
Metering/Focus System - Tie
Image Quality (raw) - D800 win
Image Quality (jpg) - D800 win
Low light/high ISO performance - D800 win
Performance - 5DmkIII win
Movie/Video - D800 win
Value - D800 win.
D800 total wins: 5
5DmkIII wins: 2
I personally don't care how many points each camera gets. However, reviews should be fair and honest.
I believe the 5d3 has a much better screen - even Nikon people say that. High ISO is also better on the 5d3. Video (when tested by proper videographers) is a win for 5d3. Most seem to say that the ergonomics (ie. how the body feels in the hand) is better on the 5d3 too. In fact one Nikon guy I know said he'd take his d3x to a wedding next time as it made his hand ache.
I don't have an issue with any of the other points.
In the end, we all know the capabilities of both cameras inside and out now.
for a video review by videographers, go to Phillip Bloom's site. http://philipbloom.net/2012/05/13/fullframeshootout/
he fairly exposes the flaws on the 5DIII and why it isn't the best video dslr because of its soft output. Likewises he looks into the D800 and concludes it does a lot of things better but also has a few flaws. Yes the 5DIII is better for low light, but to put a blanket statment that it is better all the time would ignore that the D800 edgest it out on detail and uncompressed footage option.
there is not such thing as a "win" for either camera. it is just a question of what matters to you. If you shoot motion, nature, details, the D800 is the way to go. If you shoot a lot of dark footage, 5DIII will be better suited. As Bloom concludes, neither camera scores a win overall
and yes he is a videographer, and a canon videographer so he should know right
lastly "some say" doesn't mean anything useful. Having actually used a D800, I guess I'll be part of the "some" that say it feels great, as good as the 5DIII. So there, "some recenly switched to nikon guy" just contradicted "some other nikon guy with a D3x"
That's the problem with obscure anecdotal evidence of "some guy" who is a "friend of a friend that knows some guy that told him".
Don't put weight on such silly comments. They are best taken as noise.