By request of a fellow Purist, I visited the Hublot boutique and compared those two side-by-side. Thank you, sschew, for your request (he actually requested the close-up pics of 1000 carbon, but I dare compared 1000 and 4000)!
Side-by-side:
Left: 1000 Carbon - 732.QX.1140.RX
Right: 4000 Carbon - 731.QX.1140.RX
Both 48mm case, while 1000 has Chronograph and 4000 doesn't.

First, Oceanographic 1000 Carbon

Inner bezel rotator with the protector open.

Closed

I like the blue/ yellow dial - a good accent.










Now the comparison with 4000 - 4000 is much thicker.



A bit too thick on shore 



And again, here is 1000 - thick, but not that bad. Could wear on shore day-off.



A bit big, but could wear on shore-leave 

Hope you like it. I do prefer 1000, like you do.
Have a great weekend!
Ken