I have an EQ for DT 1990 Pro Analytical pads something like this:
Preamp: -3.8 dB
Filter 1: ON PK Fc 7700 Hz Gain -7.0 dB Q 3.000
Filter 2: ON LSC Fc 60 Hz Gain 3.5 dB Q 1.000
Filter 3: ON PK Fc 4700 Hz Gain 4.0 dB Q 2.000
The 2nd filter (low shelf at 60Hz) can be adjusted to taste or disabled completely, the first filter handles 8kHz peak (some say it's pretty close to Frans' passive filter), the third one I found was a nice improvement to bring back a bit of good treble that was taken away by the first filter. I think the third one is also optional but for me it improved imaging of hi-hats for example - a lot of attempts to EQ try a narrow peak filter (Q 5.0) at 4.5kHz but when I did a sine sweep for my ears it didn't seem that narrow so I opted for the wider one and found a good improvement when matched with the bass boost and 8kHz removal.
I really think people go too overboard with close to 10 filters on these headphones, for me these 3 worked really well.
EDIT: Another optional filter can be 3000Hz Gain 3dB (or 2dB) Q 3.000, but I think this also leans on the preference of the listener and unit variation. The only one that is really needed is the 7700Hz reduction other ones I mentioned are mostly optional but I like the sound.
EDIT2: Here is a comparison of the DT 1990 Pro (Analytical pads) with this EQ to something like DCA Stealth:
I personally don't like +5dB that Harman puts so that's the reason for the deviation there. All the way to 3.5kHz the deviations are within 1-2dB as Amir said way back it's a preference curve, you don't have to chase every kink and deviation. If someone is sensitive to 10kHz and above, it can be reduced with high-shelf filter of 1-3dB, however, I personally don't like Harman levels in that range as well. When I tried oratory's EQ I found that the adjustment of those frequencies degrades the sound subjectively.