So the piano was a grand, possibly a concert grand, opened. It was heavily mic'ed, at least 3 close to the keyboard and 1 or 2 for ambience. My belief is that it was very carefully mixed and panned based on microphones, but not panned based on frequency. It was super clean sounding, and did not have the digital hash which is the hallmark of most DSP systems.
Again, this was more of a gestalt thing. You could listen to the sound holistically without hearing this L to R pan effect, but if you focused on the L to R aspect of the keyboard, you got that clearly. My friends did not notice this. Maybe my hearing is just very visual. I only got it when I listened with my eyes closed.
I guess I am strange in that, if the sound is clean and deliberate, I am inclined to like the presentation. I assume it's what the artist wanted. Not everything has to sound like Jazz at the Pawnshop to be enjoyed. I do enjoy great imaging, but I can also enjoy a manufactured soundstage as well. I won't refuse to listen to music that does not meet some uncompromising ideal of recording standards.
I understand @ghdprentice 's lamentations with DSP messing up the sound at the symphony, and completely sympathize. I hate artificial sound. But when it appears to be what the artist wants, and is very clean (again, telegraphing intent), then I enjoy it as the artist intends...