Well, briefly:
Very different headphones. Auteur are much more energetic, while HEKv2 are very laid back. It's odd, HEK are quite linear, present detail well, have well-extended bass which neither overwhelms nor hide. But...you have to listen for all that. If you just kick back, they sound nice/pleasant/smooth, but not demanding.
(a little aside) Utopia are the complete opposite, punch you in the ear with energy and detail, very demanding --
YOU WILL LISTEN!!! (end aside)
Auteur are much closer to Utopia than HEK. On a 1 - 10 scale (HEK == 1, Utopia == 10), Auteur are maybe 8. Auteur trades in some energy and detail for musicality.
Here's a visual (ignore the actual cans in the pictures).
Listening to HEKv2:
Listening to Auteur:
Listening to Utopia:
BTW, there's lots of discussion out there re: the effect of different woods on the sound of ZMF cans. Since you mentioned Teak, you should factor that into my opinions, which are based on only my Blackwood Auteur as I've never heard other woods.
Other stuff: HEK has bigger soundstage, Auteur and HEK are close to how precise their stages are (Utopia stage is smaller, but
so very precise). Auteur
REALLY love rhythmic music. As I've said many times, there are the world's greatest Deadphones (headphones for listening to the Grateful Dead).
Bottom line, if I could only own one headphone, Auteur would be well ahead of HEK, which of course says more about my tastes than about the headphones.
I guess that wasn't actually all that brief