If you had to weight the importance of levers to calipers in terms of overall braking performance and feel, what would that be? 50/50? 25/75? Etc.

Background: I have a bike with a vintage brake setup (front only) -- a Campy single-pivot caliper and non-aero brake lever. If I replaced just the lever with a Tektro RL340 but retained the Campy caliper, how much difference would that make? Loads? Some? Not at all?