I have used Canon since 2001. About a month ago I made some cash and I wanted to upgrade my mark II. I studied the mark III and D810. For my hobby the D810 had better IQ/low ISO but after I started to find a 24-70 and a 100 macro lenses for it, I discovered that the best lenses are third party's lenses. Because I hate the out of focus shots with third party lenses I bought the mark III. IMO the 36 Mpx means nothing with 18-20 Mpx lenses (according to DXO). I just prefer 22Mpx camera with 18-20Mpx lenses.