As I recall, Popular Photography panned the 1.4 Planar when it was first released. Carl Zeiss was quite infuriated with Pop Photo at the time.
However, I will say that the 1.4 Planar for the Rolleiflex SL35 series is a stellar lens. It probably is the same lens (more or less) as the Carl Zeiss T* available for the Kyocera Contax SLRs.
The f/2.0 Planar for the Contarex is an excellent lens ... probably one of the nicest out there.
The Contarex cameras are an acquired taste. You really have to be willing to get used to their quirks, as well as their weight, which is significant.
Excellent cameras still, and certain models are highly sought after by collectors and photographers.