Tim Ashley at getdpi posted his shots with 18mm Super Elmar M and 35 Lux FLE:
In short, 35 FLE has notable casts but you might get away with it at F5.6, which aperture is the first to also show good edge sharpness. F8 is into diffraction territory. Not a bad result but it won't save this lens from being put of for sale soon: its wary field of focus, also evident in these shots, doesn't suit my style.
The 18mm SE is not a pretty sight on the new Sony: it has strong and complex colour casts that don't settle down enough as you stop down. It also doesn't get near a tight edge until F8. I didn't like this on the M240 and I actively dislike it on the a7R.
LR 5.3 RC doesn't do a great job with the files: there are a lot of visible jagged edges (look for zigzag distant sheep!) but at least it opens them. C1 doesn't and Sony's IDC crashes as if DUI....Show more → Tim Ashley Photography | Sony A7R
RF lens and camera fans might wish to book mark the above referenced photographer; he is shooting a variety of M Rokkor optics on the A7r plus has a collection of Leica Monochrome images too, using the same lenses, so there may be a chance to compare. Street scenes.
- it's a 60 year old lens (late 50's Super Angulon). I kinda like the pattern! 
