Leo LS: I think this camera will have a life cycle of at least 5 years and will mark the end of DSLR era like EOS 1V marked the end of SLR. EVF and mirrorless will certainly take over.
AF sucks ..... on the MK4 ..... If you're not able to shot tack sharp with the MK4 ... I think moving to another profession is the resolution to your out of focus problem !