I was determined to get the Tamron, until I read the comparison with the Nikon 24-70 on CameraLabs.
In that review, the Tamron (as expected) excels in the charts tests, beating the Nikon 24-70 in terms of sharpness at several focus lengths/f-stops settings.
But in the real life pics (the reviewer there calls them 'Unremarkables', I don't know what he means by that) it seems to me that in terms of sharpness, the Nikon beats the Tamron in terms of sharpness hands down at all settings, except one, where they are more or less equal.
I'm not sure why and what, but the pictures are there for everyone to see.