The 35mm f/2.0 is a full frame sized lens; i.e. there's more glass inside it. So, it was intended for full frame cameras; well actually it was designed for 35mm film cameras.
It probably also has a higher build quality than the new lens as it was intended as a "pro" lens at the time it was introduced. I.E. metal body, distance scale, hyperfocal markings, etc.
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