I've got the Bosendorfer going - just missing a bunch of samples from the Room mic, so I'm testing with the Player mic at the moment. Again, it's a very nice sound indeed, however the velocity response is still pretty lumpy in my opinion. For this reason my two other "main" sampled pianos (White Grand & the K-Sounds Signature) are just nicer to play - I don't feel the tension that I feel when playing the EWQL instruments. Pianoteq is of course the smoothest, however the W.G & Signature are for all intents and purposes very nearly as smooth IMHO. I also have the Pianowave Bechstein which is also very smooth, but they've "cheated" and used filtering. (very very well done though)
EDIT: Well, just playing the Pianowave Bechstein again I'm probably being a *bit* generous in the above. Still, for so few velocity layers it does play very well.
The QL probably captures a wider range of timbres than any of the above sampled pianos I think, so it has a harder job. (the QL has the warmest/deepest sounding soft samples)
Note that I do hear more layers in the Bosendorfer than the Steinway, in general. I've heard up to 10 so far. One would have to *reasonably* assume that the number of samples in the sample folder for any particular note/dimension would be the number of velocity layers, and I'm simply not able to detect every layer in my testing so far. (there always seems to be more samples than I can hear) It would be good if there were a utility to allow auditioning of the individual samples. I understand there is a "Pro" version on the way and I assume this kind of thing will be possible with it.