I'll let others make the effort to compare him with other Gigans. But here are my own comparisons
Size of x-plus gigan vs. bandai creation's gigan
some pics with anguirus
This I thought was an interesting pic. This is X-Plus' Ghidorah 64 statue next to Gigan. Ghidorah is standing on a base which gives him about a 3/4" raise off the flat surface. This is to give an idea of how much larger a hypothetical X-plus 30cm scale vinyl Ghidorah would have to be than the statue, which stands about 16" tall from feet to top of wings.
Now here is why I think Gigan is a bit underscaled/small. I felt that he was a bit small relative to anguirus, at least going by some Godzilla vs. Gigan stills i looked up on the internet (unless the 72 anguirus significantly shrunk in size relative to his 68 incarnation...i dont recall). To compare for myself I took a Paradise Godzilla 1964 30cm scale model kit I have and compared it to the Gigan. Now Gigan is supposed to by slightly taller than any showa Godzilla. Not so here:
Now I dont know if Gigan was originally some other sculpt like the previous x-plus' have been (monster maker 28) but it appears to be a bit underscaled compared to what a true 30cm figure is supposed to be. What appears to have happened is that the figure (Gigan) is in the 30cm scale in the sense that the top of his horn is at the 30cm mark (see how it is dead even with the top of Godzilla's head), but he is not in the actual 30 cm scale. Meaning, his absolute height is 30cm; he does not stand at his correct height relative to a standard (i.e., Godzilla) 30 cm figure. This is a bit disappointing to me.
Additionally, the vinyl is a bit softer than Anguirus'. It took a longer time for me to assemble Gigan because there is no flat surface on his body to rest him against as you struggle to fit the parts in (yes, even after using heat), so you have to take care not to bend any horns/mandibles/fins/claws/etc.
The mandibles are somewhat susceptible to being bent out of position. Mine were slightly bent out of position.
All in all, still a beautiful figure.












