Old doesn't mean obsolete. American and most Blackhawks in service have been heavily modernized. With the Latest having new engines and upgraded controls including fly by wire either already installed or in the works. Engine estimates of the Latest versions are a close match to those of the suspect type used in the Z20. But the additional rotor blade and more modern streamlined body does give and edge to Z20. Thirty years of industry improvement across the globe has to count for something. Although I doubt "Way better" as long as they are using a conventional chopper configuration. Yes if does have issues at the highest of altitudes but even Chinook gets winded up there. If It ain't broke don't fix it. The PLA though deemed that there existing systems needed a replacement. And they seem to have optimized there package for those higher altitude. It might be interesting if a naval Z20 ended up ditching things like the 5 blades for more simplicity. The Chinese have floated licencing Mi26, but that's like the AN226 of helicopters. Yeah it can take you just about anywhere but is the juice worth the squeeze? I mean fuel and maintenance are a real pain for a platform that is only absolutely needed once in a while. Chinnok and King stallion are smaller and slightly more practical although I always felt the Chinnok configuration was under used. The "Hooker's" random rotor makes it the fastest chopper in US inventory it lends itself for transport and cargo by basically necessity of demanding a Bus shaped hull. As is the indigisinous big daddy of the PLA is Z18 which is about the same size as a Hip or Osprey.