Evenin', All. *bends legs like a vintage policeman, hat falls off*

I'm doing my due diligence for the possible purchase of a SD4000 this summer. I've read W44NNE's excellent write-up, and I'm looking for pictures, informed opinions, comparing the SD4000 to either the older 16600 SeaDweller, or to the newer Submariner Ceramic.

I've got a 16600, and don't wear it as much as I should. I'll never sell it - I bought it for my son when he was born - but the lume is weak, and I prefer slightly larger watches. I've tried the Sub C (i'm lucky - some of my students wear them, so I get to try!) but it felt a bit big and flashy.

So, if you've experience, please feel free to chip in! Thanks in advance!