Pianos recorded in different venues by different engineers sound different. Period. I find that the wider the range of my system (using a couple of subs) the more enjoyable pianos sound, but all are different (did I already say that?). I recently worked as the sound mixer for an Eldar show (a physical young piano genius with a hot little trio), and after setting up the 2 condenser mics I generally use for piano…lid open…he thought we should instead try a large diaphragm single condenser I had hovering over the drums, and stick it in the piano with the lid closed as much as we could close it…sounded great. A unique approach to get what the artist wanted and some EQ to keep the piano mic from low end feedback and there we went. Was it authentic? I heard Brad Mehldau at a hall near Harvard recently playing un-miked, and although the hall has decent acoustics as far as that goes, much of what he was doing was inaudible to much of the venue…authentic, musically brilliant, too quiet for that room. I had a great time anyway.