German magazine KEYS published a comprehensive roundup of review that includes 22 piano sample libraries. At the top of the list is EASTWEST/QUANTUM LEAP Pianos virtual instrument.
Here is an excerpt translated from German:
"Quantum Leap/EASTWEST presented this comprehensive product in 2008 as a digital piano representation. To this day, it is one of the most comprehensive products available. The collection offers no less than four high-quality grand pianos: Bechstein D-280, Steinway D, Boesendorfer 290 and Yamaha C7 – all recorded in the legendary EASTWEST Studios. Exquisite Neumann-microphones, high-grade Meitner converters as well as an old Neve-808 were part of the equation. The proprietary PLAY engine administers the data of the between 46 and 87 GB of various instruments that can be loaded individually. Additional effects allow further sound adjustments and manipulations. Apart from the most comprehensive Platinum version, there are also smaller, more affordable versions."
Read the full review here.