I started hunting with my dad's 16 gauge 60 years ago, and so I, too, have a nostalgic fondness for that gauge. I did not know that CZ offered their sharptail chambered for 16 gauge. It's not listed as a production gun on CZ's website, but, sure enough, BUD's is offering them. That particular gauge is fixed chokes, modified and improved cylinder, but that's a perfect set-up, and so no problem. I would choose something else for pass shooting waterfowl over decoys, but for everything else, the 16 gauge is hard to beat (if you can find the loads you need). The other nice thing, is that on a hunt, you don't have to worry about someone asking to borrow shells from you.
I did buy a 12 gauge sharptail SxS about a year ago. CZ shotguns had a reputation for firing pins breaking and the leaf springs for the hammers breaking. CZ totally redesigned the lock work and firing pins, and used coil springs for the hammers. CZ then invested in new CNC machinery at Huglu for the manufacture of their top tier doubles. One feature I like is the use of extractors only for their side by sides. I'm getting too old to bend down and pick up the spent hulls. I really like my sharptail, and I'm sure you will be pleased with yours.