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Are you working on a multi-scale display or just displaying the scales separately? If you are doing either, you're right, scale should not be an issue for you. But if it isn't then you won't mind having everything in the same scale either.
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Of course I prefer my statues are in the same scale, that's why I am sticking with the PFs for the X-Men, but not because I prefer the scale or the format (In fact I think I prefer Comiquettes), but I just don't like the Colossus or Nightcrawler enough to collect them in 1/5
...what I am trying too say is that I can't pretend that the Colossus comiquette to be in the same scale as Gambit PF!!! They are two different lines! and the only thing we can do is to wait for the Colossus PF (as well as all of the rest in that Jim Lee pic )