Natural 4 zeros texture mass matrices recently proposed by Fritzsch and Xing have been investigated by including `non-leadingcorrections in the context of latest data regarding m_t^{pole} and V_{CKM} matrix elements. Apart from accommodating m_t^{pole} in the range 175pm15 GeV, |V_{cb}| and |V_{ub}/V_{cb}|=0.08pm0.02, the analysis with maximal CP-violation predicts |V_{td}| = .005-.013. Further, the CP-violating phase angle delta can be restricted to the ranges (i) 22^o -45^o and (ii) 95^o - 130^o, concretizing the ambiguity regarding phase of CKM matrix. Furthermore, we find that non-leading calculations are important when `Cabibbo triangle is to be linked to unitarity triangle.
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