At the AD, it has almost the same case geometry of the steel one, but I don’t remember if it is 40 or 42 mm in diameter...
The movement is the same of the Navigator Perpetual, 100-07 which has a hand leap indicator (not the colored dot on the dial). The wearability is very good, due to the lower lugs, so no issues in this case: the ceramic case is lighter than the steel. The overall readability, especially in the ceramic case one, with its black dial, is simply unbeatable 😊
Best,
massi