I think that they did not go for newer variable sonar is the fact that they reportedly opted only for newer improved search and air survelliance radar. Since, its targetted as air defense ship more than anti submarine ?
Its not gonna be same always. I think Antiship missiles from china coming in 100's and their navy is also strong. unlike japan in WW2 that when there were no AA missile systems to counter dozens of air raids over them. Now both navies have SAM systems to counter Air raids and attack enemy ships...
Chinese subs have come close to US carrier group without them noticing. So, its highly likely they are not noisy, besides nuclear subs can't be as stealthy as normal AIP diesel electric don't know if that is true.
is there evidence that CAMM-ER is better than HHQ 16 A ? maybe B version of HHQ16 B is also in tables. Tables have changed I think Chinese HHQ16 A is as potent as any counter part. West dillema needs to end. I may be wrong so please enlighten if CAMM-ER is better.