Smartphone with max 4.7 inch display and great sound quality in headphones?

Hello, i want to buy a max 4.7 inch (4.5 min) smarthone with great sound quality on headphones (don't care about external speakers), and top of the line specs. From what i've found it's either iphone 6 or xperia z3 compact.
I will be listening mainly to radio so the best sound quality must be for the radio. Also another question, fm radio sounds better than internet streamed radio? Because the iphone 6 has no fm radio. The z3 compact has fm radio but according to a xda thread (i can't post links, you can search "Sound quality in headphones. Smartphones rating") has very bad sound quality.

Recommendations for upcoming smartphones are welcomed too because i will be buying it at the end of september.

Thanks

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