Because CA's A332's are an outlier in their fleet, when the other widebodies, such as the 747, 777, A340 and 767 all feature relatively dated interiors with little entertainment and inferior hard products.

Hainan, on the other hand have AVOD and lie-flats or better consistently across all their widebodies, from the (relatively) older 767's to their flagship A346s.

And like I mentioned before, comparing Hainan's 737's to those of 5-star carrier MH doesn't yield any noticeable differences in terms of hard product. And when comparing Hainan's widebody Airbuses to the 747's of TG, HU's is clearly superior has I mentioned above.