Leon, go to
http://www.dpreview.com/ and you can get the specifications on any camera known to have ever existed just about.
Use the Search box at top right with teh model you are looking at then when it loads the next page which is mainly adverts click on the camera model you are interested in and it takes you to avery good review.
Part way down the first page there is a drop down menu box which lets you look at all the data, Specifications are the next few pages normally.
Here you go for the 5D Mk III
http://www.dpreview.com/products/can...non_eos5dmkiii
Video time is very dependent on the size of the memory card you use in the camera and the resolution you choose in the camera. The SONY gets about 2 hours on a 32 gig card in 30 min sessions in high res mode..
CF cards are not used much anymore, it's all SD these days, smaller faster.