Well I am back after a long delay in Tokyo (5 hours) and 9 hour flight. Indeed, I got a 21f1.8 - currently on my R4M. Haven't seen any results yet - just back an hour ago.
It looks bigger than it feels. Fits well in the hand. The hood adds "volume" to the look though. Light (this is a 21f1.8 after all) and very smooth with the 0.5 m close focus. I have a couple of rolls of Ektar 100 shot in Japan and some black and white to soup - probably tomorrow. Jet lag and film processing is mutually exclusive.
On the R4M it does block a bit of the finder in the lower right hand corner - but not too badly. I am using one of the VC 21/25 finder on top for "fine tuning" edges - but it works without that too.
It does complete a rather formidable VC line-up, 21f1.8, 28f2, 35f1,2, 50f1.1 and the 75 f1.8 - fall and winter is coming and light is getting scarce! According to Cosina, performance is said to be "very good" - and they have taken care to make the bokeh (the fuzzy stuff) particularly good at f1.8-f2.0.
I did shoot a lot at f1.8 (spent almost 8 hours at Narita - which gave me a chance to use it at wide-open). Also some color in Kanesawa (great garden and park - and a spectacular Modern Art Museum).