I think they're definitely a bit oversized, and probably for the reason Crusader1xxx suggested. Probably using a nude and headless and smaller female body in those pictures makes it look worse.
The full sofa is more forgiving, since their real life size can vary. And I suppose even with the single chair, that first pic with the male body makes it look close enough for jazz. And it's a change from most such furniture being "playscale" and slightly undersized.
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