Lemme give it a try.....
I have a couple of stainless steel knives, mostly "no name" brands, a Victorinox and a Global gs2.
These ones I just use (and sometimes abuse). The steel is as shiny as it was when I bought them although a bit scratched as I someone convinced me they could sharpen them properly....
I have 2 carbon steel knives, a very old Henckels and the new Fujiwara FKH petty
Both of them are very easy to sharpen, easier than the stainless steel.
The Henckels is very dark in colour now. Not shiny at all. I played around with this one before deciding on the Fuji. The Henckels used to smell when you would cut onions, tomatoes etc. Esp in the first couple of cuts. This has gone since I've started using it a bit more.
It used to look like it has all colours and shades of grey and blueish on the blade. One time I decided to dunk it into a glass of coke as I read somewhere that that gives a nice patina. It came out all grey. It looks nice that way. It's also easy for sharpening. You don't need to use the magic marker trick as you can easily see the shine edge appearing when you are sharpening.
The Fuji arrived nice and shiny. It didn't stink or discolour food even with the first cuts. Maybe I've just been lucky as a lot of people complain about it.
I actually found it quite fascinating to see the knife discolour. Even one single cut leaves "stains" on the blade. I don't find that a problem and if/when I get fed up with it I'll just dunk it in some coke!
I haven't used it extensively yet, but just to give you an idea: I use it on everything I cut whether acidic or not. After finishing cutting I rinse the knife under running water and the dry thoroughly. Sometimes I use a cloth to keep the knife dry in between cutting sections. As said, it's reactive, but I haven't seen any rust or anything forming.
I don't find it a problem to work with, but if you like shiny looking knives you are not going to like it.
The other knife I have is the CarboNext.
This one is also easy to sharpen, I would say as easy or almost as easy as the Fuji. It doesn't react with food nearly as much as the Fuji, but slightly more than stainless. I can see some discolouring on the blade if you look very carefully.
I sort of maintain my knives more or less the same way, whether stainless or carbon. I clean and dry the knives quite often, but sometimes I get called away while cutting something and the knife just lies for a while. This definitely shows on the carbon (the steel discolours wherever in contact withe the food). If that happens I check the knife and see if it is just patina or rust. The latter has seldom happened, but if it does, I scour it and clean and dry thoroughly. If patina, I normally just let it be. The knife can do it's own thing, I can always sort it later.
If you are interested in carbon, I would advise going the same way as I did. Buy a "cheapish" but good quality carbon steel knife and start using it.
If I decide to buy another knife, carbon would definitely be an option.
Having said that, the carbonext seems to combine the best of both worlds...
Hope the above makes any sense. I'm by no way a good reviewer and I haven't used that many different knives, It's just my experience/opinion