The Canon 5D Mark III is probably one of the best DSLR camera Canon has made, or better yet one of the "top of the line" cameras in the whole field of photography. With its 22.3 mega pixels full-frame CMOS sensor, you will surely shoot photos with staggering quality. This camera also has faster processing speeds with its new Digic 5 processor, an upgrade from the 5D Mark II's Digic 4 processor. This allows the camera to shoot 6 frames per second, rather than the 3.9 fps from the Mark II. It also improved it's ISO range, now from ISO 50, extendable to 102800. Shooting video with this camera gave it a huge step-up against the earlier models. You can shoot while monitoring levels on screen. It also gives a 60 frame per second video shooting on 720p quality. Canon also added a headphone jack for easy reviewing of videos and a larger screen (additional .2" diagonally) for better viewing.
What may really intruige the photographers out there in buying this camera is its new 61Point Autofocus. It made auto focusing more snappy and even more consistent than the 5D Mark II (9 Point Focus Only). This camera has a silent shutter mode, making it appropriate for weddings and shooting animals. Features that made the Mark III differ from the Mark II are the HDR Shooting, Multiple Exposure and Side by side comparison.