I'm using a Carl Zeiss Jena Biometar 80mm/2.8 medium format lens adapted to Nikon f-mount on the BMPC, following Frank's recipe. Comparing with a Nikkor 85/2.0 Ai-s, it's noticeably software and looks more vintage:
(Biometar at f2.8)
(Nikkor at f2.8)
(Nikkor at f2.8)
(Nikkor at f2.8)
[These pictures were made with a Sony NEX stills camera at lowest ISO in raw, and developed at a white balance of 5600K. They should turn out similarly on the BM Pocket.]