I think it wears true to 39mm. I have 39mm Laco Fliegers and they wear bigger due to the lack of any real bezel and having a taller profile and a less refined case design. I suppose it depends on your tastes, personally I prefer watches in the 36-38mm range, 39 is my absolute limit and even then the lugs need to be not too long - I tried on a 39mm Longines Spirit Zulu Time before I bought the CW but the lugs on that were far too long. I'm not sure this will have helped your decision, but if buying new you get 60 days to change your mind.
This account is verified. WatchCrunch has confirmed that this account is the authentic presence for this person or brand.