Yes this lens is soft. I think it's 3 or 4 elements. Considering it's an old lenses, at his time this lens were categorized a very sharp lens and has a nickname "Eagle's Eyes".
Very different than now days's lenses who has about 6 till 9 elements.
What makes me prefer this over 45mm maybe because the number of blades. Old lenses usually has an insane blades. Normal blades in now days lenses only 6 to 8 blades. Old lenses has 12 (like my lens) till 20 blades (Tair 100mm f2.8 has it). It produces a very beautiful bokeh, an unique one (can do swirly bokeh too depend on the situation).