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On the subject of perceptual MP, there's almost nothing between most of the contenders, they cluster around 15-16mp, and that doesn't tell you much about the overall balance of performance. So a lens with a 15mp score may have a part of it range where it does pretty poorly, such as the wide end of the Nikon 24-70 F2.8
Consequently my field testing tries to ascertain not only how well a lens does at its best or on average but also to discover whether it has any real weak spots. Give me a lens which does "at least well enough" at all focal lengths by F5.6 and has no 'fails' over another with a higher perceptual MP score.
Also, with the Sony 24-70, whilst its apparent perceptual MP score is around half that of the 55mm F1.8 I can happily report that a blind test I did on another forum, with frames of a cityscape (reproduced in my review) only one out of quite a few viewers correctly identified the lenses at 50mm and F8. Sure I gave the zoom a light touch more sharpening and a smudge of clarity and sure I presented the files for viewing at 50% to emulate print size, but I am happy enough after quite a few comparative frames not to bother to change lenses for these kinds of shots nearly all the time. The proof of the pudding is..... etc...!