Here's my TAG Heuer mens Aquaracer. I had to look it up on the website, because I wasn't sure of the exact case dimensions, but according to the site it's 38.4 mm:
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I don't own any men's watches, but some of my ladies' ones are quite large- 42mm and 36mm.
I wear a men's Rolex and a mid-sized Cartier. I also feel the ladies sized watches get lost on my wrist (atleast for everyday wear). I am thinking of getting a ladies sized watch for fancier occasions as I do feel my larger watches look too casual.