If you have time take a look at 13 min video created by kai of digital rev, nice to see head to head comparison between these three FF DSLRs.
Nikon recently released their D600 – a cheaper full frame DSLR – that seems to offer quite a lot of the perks of the D800 and 5D Mark III at a cheaper price albeit cheaper body. Is it worth spending that extra money for the bigger bodies? We put things into perspective by comparing the D600 to the D800 and 5D Mark III while shooting boxing and Kinki.
Digital Rev? AWFUL!