We use a nightly build and test environment with TestComplete. The ProjectSuite test run takes 12h and has a huge test result tree. It is pretty complex to compare the actual ProjectSuite test resu...
Although I like the idea as well, I think this feature request could be more the domain of the test manager, rather then test execution. Maybe QAComplete (TestManager's tool) have a feature to compare test logs? Otherwise feature request for QAComplete?