I splurged and bought the Hondaline fairing, which was basically the same one that came on some later models of the CBX. It was a great looking bike and made a pretty good sport tourer, though the handling couldn't match it's awesome power.
At the time I remember reading that the Sabre had a slightly different header design, giving it a bit more power that the Magna. Something like 121 vs. 113 HP. Whether true or not, it was extremely fast. Mr. Honda made sure that his flagship motorcycles were second to none. If he were around today it would be interesting to see his response to a Diavel, Rocket 3, or K1600.