Great article. I actually thought about selling all my DSLR gear and buy a Sony a7r. But after studying some sample shots I convinced myself that the DR and resolution of the a7r wasn't that much better than my old Sony camera. So in stead I invested in a Haida ND filter and the great Formatt hitech filter rings and holder and have had an awesome time using that together with my still perfect old system.
The quality of the equipment is important but by far not the most important.