This is also what I have found, I can clearly tell that my SM3 sounds better than my image s4, but when comparing my sansa eabuds and SM3, while having quite different sound signature, I can not immediately say that the SM3 sounds better than my sansa earbuds by a big margin, actually I find my sansa buds to be quite enjoyable.
I enjoy the samsung earbuds. I find it a bit strange. But as always quality is not always price related.
Maybe it's because they are airier. I have been using closed and isolating in ears or headphones for the past 5 months. And have never touched my Hd555 after that. Well I used it 2 times this week but I heard no awesome sound I get from the small earbuds.
I dont use any Samsung earbuds but when I decided to try my apple earbuds, I was blown away! The clarity, bass and SQ sounded very good and the only difference i could spot from my EBs is that they are bassier and the mids and highs are only a little better Certainly gave me the biggest shock of my life!