Not really, the main issue is the Bluetooth profile[1] here. HFP is the profile used for bidirectional (i.e.: when you're using both the headset and microfone)

Not really, the main issue is the Bluetooth profile[1] here. HFP is the profile used for bidirectional (i.e.: when you're using both the headset and microfone) while A2DP is the profile for unidirectional audio (i.e.: when you're only listening). The main issue is that HFP uses a much worse codec than A2DP, that is optimised for voice and not music. Newer versions of HFP supports mSBC that is a simplified version of SBC (the main codec used in A2DP) that is better but still significantly worse than SBC (and SBC is not considered a good codec anyway). However I can't really answer OP question. I am not sure how iPhone get a better sound quality if what OP is saying is true (I don't have an iPhone). What I know is that in Linux you can activate mSBC and this improves the quality a lot when using HFP profile, but it is still significantly worse than anything A2DP has to offer. I also think Android uses mSBC if available, but I am not completely sure. [1]: https://en.wikipedia.org/wiki/List_of_Bluetooth_profiles https://en.wikipedia.org/wiki/List_of_Bluetooth_profiles