Some data points from HK:

Respected my DCC choice:
Marks & Spencer (All Branches)
La Rotisserie
Others that don't come to mind right now.

Did not respect my DCC choice:
Ajisan Ramen
El Taco Loco

Overall DCC is not that high in HK from my experiences. Say around 10%. Of those only a few were problems. Though I must say I was surprised at the one time I had to use a MC in Shenzhen I thought I would have to chargeback but it processed correctly.