I have owned a number of them. I don't now. If they were all that great, then countries would still be using them.
Better designs came along within the Eastern Bloc. Doesn't mean that the SKS isn't still a highly effective and reliable weapon.
One point to keep in mind is that if you own an SKS, you actually own a firearm that was a main battle carbine of several major nations, constructed with arming their soldiers in mind. When you buy an AK, on the other hand, you are invariably buying a gun that looks like an AK-47, but was actually made specifically for the civilian market, not a military.
