Hifishark is a good way to spot headphones....
The AKG K240 sextett is hard to beat.... i recommend them even over the AKG K340 because it is a picky very demanding headphone, more complex and more probability for it to be broken or defectuous in a way or in another... And the confort of the sextett is better because he is lighter....And some dislike the K340 because it is very hard to embed it right anyway he ask for strong very clean amplification among other things....... The sextett is unanimously well reviewed and more easy to drive but ask too for better than just a small headphone amp though...... I just purchase one and i like it even if i prefer my K340....I will keep the sextett, this say a lot...
The sextett has the same soundfield as the k340 with less impact but it is more relaxing..... The two headphones are "cult" for 40 years and more.... The reason they are so good is they partake inside the cups the same acoustic devices... A work of genius by one the AKG founder, a physicist... ...
AKG patent for the passive acoustic diaphragms by Dr. Goerike:
Akg K340 patent https://patents.google.com/patent/US4005278A/en?inventor=Rudolf+Gorike
The sextett had enough bass ( but no deep 20/30 hertz bass) , good non fatiguing highs, beautiful mids and timbre and an holographical soundstage.... To beat it you must pay a lot of money, really a lot.......It is the twin little brother with a singular dynamic driver of the hybrid K340.... From AKG i own also the K701 but these two beat it completely for me with a more natural sound .... I dont listen the K701 at all...It sound artificial and it is fatiguing compared to the K240 sextett and the K340 ....
If your friend is not afraid to lose his money and take a risked purchase and is able to work hard to embed the K340, then yes i recommend the K340, for me the best headphone i ever heard, the more powerful hybrid created with an electret and a dynamic cell... .... Impossible to beat under 1000 thousand bucks and perhaps more...As the sextett in a lesser way , the holographic soundstage is speaker like... The imaging is very precise.... For me it is a "drug" and i never liked headphones but i can no longer listen to speakers .... The sextett and the K340 is the first headphones i liked very much without being frustrated.... I purchased 9 others in the last 20 years...They are under my bed.... RIP....
My best to you and to your friend....
