Yes, various internal improvements, much better head gasket situation after 93....less oil foaming....
My experience (6SCs) is with the "generation 1" motors.....don't know about high horsepower reliability....but s the motor up to say 300hp can be beat to crap day in and day out....which I've done now from about 60K to 140K on the motor....
This is one reliable engine....I originally read that it passed Ford's 1000 hour toture test...where the old 5.0 didn't.
Ignoring the other annoyances of the SC...you gotta love the motor....