I've gotten answers both ways from their employees when asking whether their Classic Wedding bands are comfort fit. Fwiw I'm looking at the 4.5mm version. The edges seemed to be beveled but the main surface appears flat so I'm not sure if that qualifies or not.
https://www.tiffany.com/engagement/mens-wedding-bands/tiffany-classic-wedding-band-ring-GRP00370
https://www.tiffany.com/engagement/mens-wedding-bands/tiffany-classic-wedding-band-ring-GRP00370