It seems to me that the look that you are after won't be found in 60's and 70's lenses as they are mostly very sharp and contrasty. Go for something uncoated and shoot with a bright light source and the resulting coma gives a wonderful glow. I agree about the Triotar and an uncoated tessar wide open gives a marvellous old world effect. Find these on an old Rolei or Super Ikonta. Nicely rounded aperture blades make for great out of focus areas too.