I have both, a Norinco SKS and a CZ 858-2. I really don’t see how people can say one has better sights than the other; they’re both the same to me.
I’ve had more jams with my SKS than with the CZ, and on the CZ only when I shot it dry with the first 20 rounds. It has never jammed since I put some grease in the right places.
I don’t own a more expensive SKS, but the Norinco can never be compared to the CZ; the wood is crap, so soft the metal now floats in it from recoil. It gives about 50% larger groups than my 858, and that’s even when the wood was tight. It is heavier and longer, a hell of a lot less ergonomic and way less comfortable to hold than the 858. And although the feel is a very subjective thing, the SKS may be more comfortable for you, there is one thing that sets the 858 above the SKS, something which hasn’t been mentioned here, and that is the trigger. Even though my 858’s trigger isn’t as good as my Garand’s trigger, it is light years ahead of my SKS’s trigger. I could accept all the SKS’s shortcomings against the 858, considering the price difference, if only it had a decent trigger. But from all the firearms that I have, this SKS has the worst trigger. In fact, it has the worst trigger I have ever pulled on a firearm, ever. The trigger for me makes the whole deal, even if we forget all the other features that make the 858 superior. YMMV