I work with manufacturers in China, Japan, Mexico, Korea, Thailand, Malaysia, Europe, all over the place, and yes there is a difference. That's not say that the Chinese are physically incapable of making quality parts, but you tour equivalent plants in Japan and China, and you will see a couple major differences:
1. The Japanese quality culture permeates down to the every operator working on the line. The Chinese culture of cheap (product is cheap, and people are cheap) also permeates down to every operator on the line. Often times I find that it is difficult to change the mindset of the non-quality culture employees from "cost and output is king" to "quality is king". When you are talking about a high quality product, you NEED the operators actually performing the build to understand how to make quality product, and actually follows through. That means investing training into operators, and establishing and enforcing operating procedures and equipment.
2. Raw materials are better. The over-arching quality culture extends down to the companies I don't directly control, so my suppliers follow the same trend. This is very important for tools.
3. Cheap people means you get more manual processes rather than automated ones. This doesn't just mean making a cheaper process with automation, it means not improving a line because you can just have more people inspect the parts. This is not as good.
4. Many companies in China that make high tech and high quality products are actually Japanese companies, and are run by Japanese engineers. It feels like a class system when they talk about this point...
And on that point, the "high tech" products mentioned (Apple, TV's, etc...) are not really very "high quality" products. The circuits are cheap by circuits world standards. Automotive, military or Nasa are a whole different ball game. That may sound extreme, but those 3 industries often have similar requirements, and they are a whole different level from consumer electronics, etc.
Anyway, for tools, when you are talking about a sensitive process such as heat treatment and raw material quality making the difference between an heirloom tool and bottom of the barrel, I would feel alot better about it being made outside of China.
And SK isn't tied to craftsman at all, and I don't think they ever have been. SK has been owned by FACOM, were independent, and are now owned by Ideal. Craftsman is made overseas, but used to be made by Stanley and Danaher. So basically, they are the same as Husky, Kobalt, or any of the other mid-range brands.
Anyway, these days, any hand tool you buy should have a lifetime warranty, and shouldn't break within 10 uses (so harbor freight is out, thought I do use them occasionally). I say buy whatever is easiest for you to return or get repaired.
But if I could afford it, I would buy all Snap-on, MAC, SK, Cornwall, etc. They really are better, just not necessarily necessary.