I am “cursed” with an excellent sense of smell. It really is no fun. It has been handy a few times. I detected an electrical fire at work long before anyone else could smell it. All in all though it is a pain. Perfume, body odor, bad breathe etc. are really a problem.
I'm just the opposite. I have a poor sense of smell. I can only faintly detect the odors of a few things, like the sea air, cooking meat, perfume/flowers, and oddly enough, gasoline and ammonia. That's about it.
There are some things I would like to be able to smell, like smoke, natural gas, etc.