yes, the old 35mm f1.4 lens is perfect for environmental portraits.
It does have a more classic rendering / drawing that many prefer over the more modern lenses (including the 35 f/2.0 you already own).
the lens is also small and quite light and it focuses quite close (and it is sharp when focusing close, in contrast to the lens you have).
The more modern lenses (eg. 33mm) may focus faster but they are large and heavier and have a different rendering.
For me I keep coming back to the 35mm f1.4 because it renders everthing so special and it yields a certain 3D look that not many lenses have.