I use a range of camera lenses dating from 1930 to 2012 and they are all different contrast wise and all produce very usable negatives. Except for one lens - the Novar on my Tenax I dating from around 1941/2. Contrast is so low as to be unusable.

If the lens is not visibly damaged (my Tenax I has a visible white cast to the lens), then you can compensate in exposure/development.