A while ago I bought a used 10mm f/2.8 pancake lens for my V1.
Idea for it came while I was going for a run and I noticed that 10-30mm and 18.5mm lenses were too long lenses to put in the pocket.
Like the other Nikon 1 -lenses 10mm f/2.8 lens is also a good performer. Shooting wide open is not a problem at all. I think this lens would be better paired with J1/J2/J3/S1 cameras, because those are already smaller. I think I might get one of those as a backup some day :)
Here are couple shots from that 20km cross-country skiing trip.