Quality Differences Among Builders

Are most of the major yards that build custom yachts about the same in the quality of the product that they turn out?

Would any of the more experienced and knowledgeable members like to try ranking some of the top yards in areas like quality, innovation, ability to solve unique owners' requests and price to value ratio?

Are any of the top yards consistently more expensive to have one's yacht built by them? Are there any benefits to the new owner to "overpay" for the same boat built by a more expensive yard?