Canon 1DX - Canon's Awesome Flagship Camera. 

***** Thanks. I have that program too. Nice program. I am not sure I am up to date with it though, I will have to check and see.

Just start with some very basic info (and then I will answer your question). The Canon 1DX and the Nikon D4(s) are Canon's and Nikon's flagship and highest level cameras. Everything else is below them and are lessor cameras in one way or another. So to answer your question, yes, the focus system on the 1DX is better in low light and ALSO able to lock on better in lower light than the 5D Mark III. The 1DX is also superior in focus tracking on moving subjects. Some will read this as bashing on the 5D mark III, but if read carefully, I did not say one negative word about the 5D Mark III. The problem comes when people want to "think" the 5D Mark III is equal to or better than the 1DX, and it simply is not. To be even more aggressive in my statements, I think a professional photographer should always get the best camera they can afford as their tools of the trade. This isn't casual photography. Sports, weddings, and other event photography is a one time event and should have the best available to do the job. But - and I am not finished - there is no problem actually buying a camera that a person specifically chooses to do the job as long as the photographer is aware of the features they are willing to forgo or don't think they need, and makes a conscience choice and not an uninformed choice. What is a poor mindset is when I read or hear someone say that the Canon 1DX or the Nikon D4 is not a wedding camera. They most certainly are, and they are in fact designed to BE the ultimate wedding cameras, and it is so stated exactly in the definition of the cameras. Thanks for your question, it gave me the opportunity to say something to the comments that are made to me when they say the 1DX is not a wedding camera. At that point, I have to question if i am really talking to a pro or not.

Thank you, Peter, you really helped me see things a little differently. I totally agree when you say to use the best equipment in our work. I confess I was not sure the 1DX have the characteristics of a camera for marriage or that was designed exclusively for sport for its high performance. With 5D MIII have lost some espontânios moments I most appreciate. She is a great camera and do not intend to change, but rather, add the 1DX. Can be sure that I will get increasingly perfecting me to deserve the title of professional (rsrsrsrsrsrs).

Here is a quote from Canon's own web site (USA) "The choice of professionals in fields ranging from extreme sports to wedding photographers, the EOS-1D X DSLR camera is incomparable in speed, ruggedness and precision. And it only gets better. Responding to user input, the new Firmware Update Version 2.0.3 adds enhancements that provide improved AF performance and more control of exposure and customization, helping to ensure EOS-1D X users have an ideal tool to do what they do best: capturing those golden opportunities, wherever and whenever they happen." What they are saying is that the best of the best that they have, bot in materials and in technology is in the 1DX. Some of it is in other cameras, but not all of it in one camera other than the 1DX.

See if you can get your hands on a canon 6d.i own one.2 nd best to none.

+Anthony Harriott Agreed. I use two in weddings, one with the 16-35 and the other with the 70-200. The center point can focus in pitch black conditions and iso 12800 is the cleanest from any camera ive seen... tho i would love a 1Dx.