So on a Z50 which is under way to me…...this lens would work.
I now found out the there is a wide angle attachment on the lens to make it a 35mm.
I could live with the 50mm alone.
In the bottom of this link the lens construction can be seen and the lens without the wide angle attachment:
http://www.klassik-cameras.de/Biotar.htmlIf the lens was used wide open for the candle-light scene it must be fine at 0.7.
After all probably better to invest in a Noct95 as the 0.7 might be as expensive on ebay if possible to find one.