Hi
I have listen to S5 and Q3 and i did buy Q3, may ears think they sound quit more natural. I think it is little to much bass in the S3, i think you have to have big room to get the sound in S5 good.
I did ask Alon Wolf in the Munich mess what he did think about Q3 V/S S5 and he said : Q3 are better they are much better! And after listen to them both i agree
Espen L