The 35 zeiss is comparable to leica equivalent. I think the rx1r has a better sensor than the m9 in terms of high iso, but I think the m9 gives a closer look to film. The main down side I can see for the rx1r is the focusing, I think I can focus better than it with my m9's rf.
And for me the rx1r is still too large and too close size wise to my m9, for small body I enjoy the GR