I obtained Sony A7R to supplement my Canon 5D2 bodies in studio. The Canons are far more useful for fast action, Sony AF being useless. It’s as slow or worse than the first serious AF body, Maxxum 7000 from 1985! Manual focus is also quirky, with focus peaking being inaccurate in unmagnified view but very precise once zoomed in. The main reason for adding this body is for the 36MP sensor. The extra resolution will be a big help when preparing huge SHOT show display prints.
Two quick examples below done with Canon lens on a Metabones IV adapter. These are JPEGs straight from the camera, reduced to 1200px (click on the preview to see larger). The insets are 1:1 once magnified. This is the first camera I’ve owned that produces useable JPEGs in addition to RAW files.