I was going to say sigma 60f2.8 but the comment on the 35-100 suggest after wide open the resolution should be decreasing; the sigma is availble for NEX and it is one of the sharpest lenses in existent but the profile of the curve doesn't fit; unless it sharpens up a bit after wide open.
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We don't use dcraw for the tests.
The lenstip shows that the 27mm has bad border resolutions. So I am sure it is the Tamron 90mm.
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Actually, the lens has a some field curvature so the chart is misleading to some degree. ;-)