There is only so much you can do with pixilated blocks but to respond properly to your question, no. I think each gender was portayed to the best of it's ability and in the FMVs it was obvious on genders of each. In battle it was pretty obvious also.
Barret was very male in his pixilated form but there where others like Cid that still porteyed a masculine figure. Vincet is a tough one in that forum but the CGI scenes do a good job of depicting him as a male.
So to put it simply, no.
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