Raul, I think JP already pointed out to you that it is folly to judge any two closely matched turntables in general by factory published specifications, because we don't know how the measurements were made. In particular, we do know that the P3a specs were determined after there was a revision in the methods for measuring S/N that made everything look better (quieter by I think about 3db) than it did before the change in methodology.
On the other hand, I do agree with you; the P3 or P3a may well be superior to the Mk3, but not based on the differences in factory published specifications. However, I would posit that the Mk3 offers more possibilities for upgrades that might bridge any gap between it and the P3, because of its more modular construction. I don't deny that I would like to own a P3, in order to hear it for myself in my system and decide for myself where it stands in the pantheon of high end DD turntables. I suspect its plinth is not up to modern standards, although everything else about it apparently is.
Of course, this is coming from an uninformed philistine who cannot tell music from distortions.
