Summary: I also own a Nikon D3 for comparison. The Canon's auto-focus and low light performance are noticeably improved over the Nikon.
Pros: Fast, precise auto-focus, outstanding low light performance, solid construction, dual CF card slots, unique situational focus modes, dual processors with one processor dedicated to focusing. Canon has an $800.00 rebate good until 03JAN2015 on the US spec 1DX.
Summary: I managed to find a low use used copy. It's not as flashy as the latest and greatest models, but it can help create first rate images. There is more to "megapixels" than a number. It is very easy to make 13" x 19" prints from this camera without additional processing.
Summary: I received this camera and a 24-70 mm/F2.8 II lens as birthday gifts a couple weeks ago. The camera looks cool and awesome. Since I had been taking photos with point-and-shoot cameras (my most recent one is Canon G12), this 1DX is a lot complicated for me to handle.
Summary: There was a question about weather this camera is good for beginners or not. There was the comment I did not like. The comment was that you should buy a rable for beginner with automatic settings. I totally disagree. With an automatic camera you will never learn photography.
Don't let the 18 MP or price dissuade you from giving this body serious consideration
31 March 2014
Summary: This is the best digital SLR camera in production right now. We finally have a full frame high frame rate camera that has excellent dynamic range, great resolution, and a compact flash card write buffer and write speed capability that has never been exceeded in my use of this body.
Summary: I have gone from the Canon Rebel and as I've grown as a photographer not only bought newer models but more professional models. Now I shoot with the 1DX and 5DIII. The 1DX is the most fun, fastest and best photo tool that I've ever owned.
Summary: I have had this camera for about a year now. It has not failed me. I have specialized in photographing stage shows. This requires rapid fire, bouncing around stage pits, shooting on stages with weird lighting and moving fast. It is a heavy camera.