Comparison Pictures of 5 MF Lenses, taken with Olympus E-1

Zuiko 1.8/50 (front ring marking: "Made in Japan"):
positive: outstanding wide open corner sharpness, good sharpness generally
negative: slightly fuzzy bokeh

Hexanon 1.8/40mm (pancake):
positive: good wide open corner sharpness, good sharpness generally
negative: fuzzy bokeh, more flare and blooming than the rest at f=1.8

Helios 44M MC 2/58mm:
positive: good center sharpness wide open, good sharpness generally, beautiful bokeh
excellent portrait lens
negative: reduced corner sharpness at f=2

Jena T (Zeiss Tessar)2.8/50mm:
positive: good general purpose lens, good sharpness, soft bokeh
negative: limited brightness f=2.8

Oreston 1.8/50mm:
positive: acceptable center sharpness fully open, acceptable sharpness generally
negative: unsharp corners at f=1.8, fuzzy bokeh