Just got a new unit in. Here are the measurements:
B&K 5128 Default:
Compensated to flat DFHRTF and represented with a 10dB tilt since nobody likes flat DF
B&K 5128 Raw:
GRAS (vs Harman OE 2018):
GRAS Sound Signature (Smoothed to same degree as target):
In my view, both the Stealth and Organic are a tad bright, with the Organic having even slightly more treble, but the Organic also has a bit more bass and is bound to be easier to EQ. So it’s likely the better buy at the moment.