I have a 5dMk2 which I mainly use for landscape and portrait photography. Now, I want to buy a second body (preferably a 1D series for the high burst fps) to use it as a back-up of the 5d and also to use it in sports photography and also in low light conditions such as ballet shows and other theatre and concert shows.
If I have money, definitely I would buy the 1DX but it is too expensive for me. My dilemma is between the 1D MKIV and the ID MKIII. I really like the image quality from the 1D MKIII but my issue is how it performs in low light. Is there any big difference between the MKIV and the MKIII in terms of image quality and performance??
Thanks a lot in advance.