To get back to what Gileon said, I must agree that the Thiel CS1.5's are very enjoyable on piano. I have heard the CS1.6's, and while the focus has certainly been bumped up a notch, I wouldn't necessarily call them more musical. Of course, I did not get to A/B them directly, and it had been some time since I had heard the CS1.5's. However, with regard to larger Thiels, I own a pair of CS3.6's, and I find them to be very enjoyable on piano, with good lower register reproduction (and I am an upright and electric bass player, so I like clean, tight, accurage lows).
I must add, though, that my father-in-law has a pair of CS.5's (which I helped him pick out, thank you) that are simply amazing for the money. Sure, they are frequency limited, but match them up with a good sub or two, and they can hold their own against speakers several times their price. The greatest thing about these particular speakers is that they really got my father-in-law back into listening to, and enjoying music (mostly piano). Of course, my mother-in-law is not so thrilled, but hey, you can't please everybody.
Later, Tom.