I guess it depends of course if you are talking about a Leica or a something like a Zeiss Ikon which does go down to 0.5m.
My 15mm CV focuses down closer than 0.7m and given its 15mm its pretty easy to approximate closer focus distances than I can confirm with the RF but with a 35mm I just don't know how you'd be able to really guess at what the focus is unless you got out a tape measure.
I've got a 35mm f1.2, original version in the mail right now, which was my lower cost alternative to a Lux, so I guess I'll know firsthand just how tricky it can be at MFD, but I'm thinking my keeper rate is going to be pretty low, at least unless I stop it down a bit