In addition, like the caption in the Chinese words said '直20:用性强,一机多型,一机多能', Z20 is a very good utility helicopter which will have many variants and special modified versions for specific operations. Apart from using in the PLA Army, the improved variants can be developed for Navy, Air Force, Coast Guard or Civilian's operation needs. We can expect to see China will mass propuce this heli in great numbers.Z20 is capable of flying in high altitude, so it is well suited for Tibetan plateau/ Himalaya moutain region, while Z8 and Z9 are excellent at sea level but not high altitude.
Another advantage is its size is tailor cut for hangars of navy destroyers and frigates. It is much larger than Z9 and can carry more equipment, especially anti-submatine detection gears and torpedo. Z9 is restricted by its small size and Z8 is too large to be based on DDGs (except type 055) and FFGs.
In short, Z20 is one size larger than Z9, and one size smaller than Z8.
The PLA Army logo and timing of the Chinese TV release may hint Z-20 can be readily used in a potential boarder war at high altitude area.
Only if China can bring down the weight of AH4 to match that of M777Can Z20 carry AH4 Howitzer in Tibet?