The 94TX is a lot closer to the new SC receivers (except the SC-09 flagship) than the other 9-series Elite receivers.
The biggest differences are networking and the SC-07 will upsample all incoming audio signals to 24/192 for advanced processing. I believe the SC-05 and SC-07 will have more efficient and/or cleaner power.
http://www.infosyncworld.com/news/n/9317.html
That's a decent read at the differences.