They're not. The diamond tweeter and improved bass are miles better than the old 80x nautilus range of any flavor.
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A recording studio has far different requirements than a home's hi-fi, so be wary of the marketing.
The 801 will have a fuller sound that the 803D's won't be able to match, simply due to its size and woofer configuration. However, the diamond tweeter is far superior and lifts the overall tonal quality of the new series far above the older models.
It's really a matter of budget, availability, and (most likely) the size of your room. 801's need a huge amount of space to properly throw from that 15" woofer.