It looks like the MiG-21-93 and MiG-21Bison both retain the original MiG-21 wing planform, not the modified one the Chinese have adopted for the latest J-7 variants. 'Twould be interesting to combine the Chinese wing with either of those other two, though I'd be tempted to keep the trailing edge straight and mount wingtip IRAAM rails. I may do that for an advanced Ye-8 derivative.