>>3140510pentacon six connosieur here.
out of the zeiss jena lenses, the 180mm is pretty decent and gives that oleg oprisco dreamy bokeh. the 80mm is kinda meh, bokeh is so-so, bland lens, youll get more character out of your Vega. 120mm jena is good too. if you want wides, get the MIR MIR 45mm 3,5, that lens is amazing, distortion is minimal for what it is. or maybe you could get the flektogon, which is coated, and has better sharpness, but i personally prefer the 45mm.
pic related is the 120mm iirc.