We are bought just Canon EOS 450D,which think is OK for us as amateur.If you are really thinking about the better camera,rethink for what reason you want to buy,if you are just like we are amateur and you have PC with PS and some great plugins(HDR) you should be OK with any DSLR
Here is good test of both Nikon D4 and EOS 1DX
http://www.techradar.com/news/photog...os-1dx-1052236
Jura