I have the lens -picked it up in Tokyo a week ago. It is a slightly tweaked formula and the barrel is similar to the 50mm f1.5 M-mount Nokton with the "vintage" style knurling - which I like as it is very easy to hold and turn. Mine is a 46mm filter size - but I also saw some with a 43 filter size. Indeed, it does go down to 9.5 m. I shot some stuff on 400 film at Haneda airport and I have been shooting 100 iso film with it here in Vancouver - but have yet to process those rolls. I like it - I always found the LTM version a bit "clumsy" to use with its tapered front, which made getting to the aperture ring a hassle.
The 40mm f2.8 is interesting, it is dedicated to be used on the VM-E close focus adapter - it does not have a helicoid ( a bit like Nikkor Rf lenses and Contax lenses of the past). Truly compact and "cute" (i know it is a lens - but that probably the best description of it.
The reworked 15mm f4.5 is now compatible with digital cameras. The older version worked fine, but some users complained about edge performance. The new one takes care of that. It can of course, still be used on a "film" camera without loss of performance.
I will work son some pictures of and with the 35mm f1.7 today.
There is also a 10.5mm f0.95 for the Micro 4/3 rd format. Big, but it is after all a f0.95 so the law of optical physics apply - you need big elements for that speed!