A:Answer For the average consumer, nothing. Technically, the Z9D has more than double the FALD zones, around 600 compared to the 250, which will produce much better black levels with deeper and richer blacks. This will allow less blooming while watching HDR content. Additionally, the Z9D gets slightly brighter than the 940E, which makes HDR content pop a bit more. However, the Z9D is about $3,000 more expensive than the 940E, and for 90% of consumers, not worth the extra chunk of change.