I've heard the 5103 against the ls16 head-to-head and definitely preferred the ls16. The AR had better depth and a wider soundstage, but the main difference was transparency. The ls16 was much more open. Dynamics was closer, still giving the AR the nod. It's not exactly a fair comparison since there are so many other things the 5103 does besides play 2 channel music. And you'd be hard-pressed to find anything better sounding for music that can also handle your DVDs than the 5103. But the ls16 was a clear winner to my ears. Only thing I've heard beat it was an Ayre K-5x.
Best wishes,
Friz
Best wishes,
Friz