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The radial mount master cylinders (636) that are on most sport bikes these days are better than your old master cylinder. The f4i master is no better than your f2 master cylinder though.
They are better but not much. If you want a honda MC grab an '07 & up cbr 600rr. The '05 R6 & up has a radial mount as well as the '05 & up ZX-6RR. Not the ZZR though.