I borrowed @renaudrenaud 's pair of K371 last week (after his pair of K361 two weeks ago) to listen to music at the office.
I can only apply EQ in Foobar because I can't install EqualizerAPO, since I would need administrator rights in Windows.
Right now listening in Foobar with Amir's EQ...
I suspect that most people who say they don't like the Harman curve have EQed theit headphones to the Harman curve based on a frequency response graph where the Harman curve was already applied.
I have also experienced that speakers with no waveguide can have a great stereo image. I don't know why. A waveguide is usually better for tonality though.