Actus + Rodenstock Rodagon WA 60 + Sony A7r is a super duper setup. The WA 60 is sharp, contrasty, and provides true flat-field focus. It is well-corrected: virtually no CA, linear distortion. It is sharp edge to edge.
Other outstanding lenses (all work with the "0" M39 lensboard): Rodenstock Rodagon APO 80/4 N, EL-Nikkor 105/5.6 N, and the latest version of the Rodenstock Rodagon 135/5.6.
The EL-Nikkor 105 f/5.6 N is often listed on eBay. It's a bargain.