OMG! Forget LR4 for noise. I usually don't turn many enhanced features on on a camera but I decided to test things out and while the sharpest image at 25,600 iso is no noise reduction even the middle (standard) noise reduction is very nice! I plan to keep it on standard. According to page 145 in the 5dm3 manual in low iso's it further reduces the noise in the shadows only not paying attention to the rest of the image.
I am including a screen shot showing no noise reduction and standard noise reduction in camera. For those who want super techy views and full images. just go ahead and do it then post, i don't care to. If your eyes dont see what i am saying then just look into it for yourself.
Shooting sports often times things are pretty harsh and backlit rendering 1 to 2 stops over exposure to expose the skin correctly. The highlight tone priority that was first introduced in the 1dm3 and now also in my 5dm3 is wow! I used it on the 1dm3 on occasion, but with the 5dm3 anything lit strongly be it window light or sunlight the blown areas are reduced to pretty much nothing! It truly is amazing. According to Canon the highlights dynamic range is increased and the shadows dynamic range lessened but unless the shadows are crucial to the composition highlight tone priority is the bomb!