After spending more time with the Sony and playing with filters on the Cascade I want to better explain the differences.
The Sony has great bass with exquisite details. When the music requires it, it can go deep but it's very clean and detailed. On the Cascade the bass is a bassheads dream, deep and impactful. Like being at a concert where you hear and feel the bass. However by doing this, the bass is not as clean and detailed. With the #4 filter in the Cascade, the bass details are improved but still nowhere near the Sony. Maybe Ken can get future headphones to sound closer to the Sony
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Another reason the Sony might not have the bass impact could be the stock cable which is silver plated copper. Because of that I decided to splurge and ordered the Kimber AXIOS-CU for the Sony. This cable is 16 strand.s of copper and is supposed to improve the bass and treble details. Hopefully I'll have it before next weekend and will provide an update once I have it.
In either case the Sony is my primary headphone for serious listening and the Cascade for everything else.