Chief scientist at Thoughtworks and author of Refactoring, Patterns of Enterprise Application Architecture and Refactoring: Ruby Edition. His bliki at martinfowler.com has been the reference text on refactoring, testing and architecture for two decades.
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Their wordsIf you make a certain level of coverage a target, people will try to attain it. The trouble is that high coverage numbers are too easy to reach with low quality testing.
Their wordsI would be suspicious of anything like 100% - it would smell of someone writing tests to make the coverage numbers happy, but not thinking about what they are doing.
Their wordsAny good developer knows that they can code the same stuff with huge variations in lines of code, furthermore code that's well designed and factored will be shorter because it eliminates the duplication.