Whether you will see any improvement depends entirely on the OE hoses, and the type of brake use. The one difference that the braided hoses can provide is a reduction in hose expansion. With less hose expansion, brake force application is quicker and more direct.
One thing that many people miss is that far more than just the hoses play a part in a soft feeling brake pedal. The brake pads and/or shoes, the brake fluid, caliper rigidity and even the way in which the caliper is mounted, all play a role. Fixing one issue will not resolve a series of faults. One item will not turn an OEM braking system into a racing grade brake package. You've got to look at the system as a whole...
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