I don't recall this picture being posted here before -- but confirmation that 052D has the same type of VDS as 056A and the last few 054A, at last!
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The presence of VDS is quite important IMO -- for a surface combatant, outside of having an ASW helicopter, a towed variable depth sonar is the next best sonar type for ASW work... and it's even better if that VDS is accompanied by a straight line towed array sonar.
We know the 18th 054A and onwards have a VDS + TAS, which makes 7 054As with VDS + TAS (assuming 24 054As), add that to 8 current known 056As with VDS + TAS (with more likely in future), as well as all 12 052Ds virtually guaranteed to all have the same VDS + TAS outfit as well... that makes 26 surface combatants with quite comprehensive ASW suites including hull sonar (all of those surface combatants have hull sonar) + VDS + TAS... the last of which are likely to enter service by 2020 (given the last 052D will probably enter service around then).
And that doesn't include the likely possibility that more 056As will be built in the short term, as well as the likely possibility that the 054A successor in a few years will also have a VDS + TAS outfit as well of at least equal capability.... and add to that a possible order for a further twelve 052Ds... not to mention 055s which likely will not forgo a comprehensive ASW suite either...
Considering all that, as well as the fact that all six 052Cs have hull sonar + TAS and 054As 1 to 16 have hull sonar + TAS as well, then that actually gives the Chinese Navy a very large fleet of surface combatants with comprehensive sonar suites for ASW work.
Obviously we don't know the exact absolute capability of those sonar suites, but the fact that they're paying so much attention to giving them at least the
types of sonar that are needed for exceptional ASW ships is encouraging.