I agree filip, I posted way back on this thread that I believed Thanos to be closer to 1/3 scale than 1/4.
I think that the longer you are in this hobby you become quite astute at judging scale / size of pieces, well some of us do anyway, others well they are rather "special" and will just repeat what they hear from others (such as Igo bullsh!#ing everyone and trying to make people believe the piece was 1/4). Well if Igo said it, it must be true right,, yeah... (well, no - he bullsh!%ed you).
I am actually glad that the piece is 1/3 scale and will be proudly displaying him with my other 1/3 scale pieces.
Each to his (or her) own, and if my fellow "freaks" choose to display Thanos next to 1/4 scale pf's and such, well go for it.. - Do what works for you.
(E.g: I currently have the old school "X-men VS Sentinel" dio's displayed with the "Sentinel Maq's and they are all surrounded by 1/4 scale pieces - so talk about different scales being placed next to each other).
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