I haven't been on a flight to KHI, but I have been on the HKG-BKK-BOM (CX 751) service. In Y, I don't really see any difference. If you're not on the new non-stop, then in terms of entertainment, you'll have TV options to BKK and movies to BOM. But on the nonstop you'll have TV/Movies. Otherwise, its standard Y. The J is Regional Business. That's as much as I know. Take the nonstop if you can. Stopping in BKK is horrible b/c they don't even let you off the plane.