Is DAC grade same in all iphone models?

[sudhirbhosale]

Hi all
1. Planning to buy iphone and highend music would be one of the preference.
iphone models has DAC I think wolfson. I want to know if all iphone series like iphone 6, 8 etc. use same grade DAC or costly iphone would contain most advance/higher grade DAC.
2. Which are other models has DAC. I know LG V series and some models of VIVO, Motorola, HTC.
3. Are DAC from non iphone giving same music quality


Thanks